Welcome to Bunker Talk. This is a weekend open discussion post for the best commenting crew on the net, in which we can chat about all the stuff that went on this week that we didn’t cover. We can also talk about the stuff we did or whatever else grabs your interest. In other words, it’s an off-topic thread.

This week’s caption reads:

Illustration shows a visit to the Commandobunker of Kemmel, in Heuvelland, Friday 18 March 2022. After World War II, in the middle of the cold war, several countries including Belgium, France and Great-Britain, decide to build a bunker to coordinate west Europe aerian defence. BELGA PHOTO KURT DESPLENTER (Photo by KURT DESPLENTER / BELGA MAG / Belga via AFP) (Photo by KURT DESPLENTER/BELGA MAG/AFP via Getty Images)

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The post Bunker Talk: Let’s Talk About All The Things We Did And Didn’t Cover This Week appeared first on TWZ.

The South Korean government has released images from its first successful test of a domestically developed hypersonic boost-glide vehicle. This includes shots of the vehicle impacting the water at the end of its flight. A weapon of this kind would give South Korea a significant new way to hold targets in North Korea at risk amid an ever-deepening arms race on the Peninsula.

South Korea’s Presidential Office, more commonly referred to as the Cheong Wa Dae or the Blue House, announced the test in a Korean-language press release yesterday. The Blue House initially released a video of President Lee Jae Myung and others observing the test from a conference room at the Anheung Proving Ground, which is located in South Chungcheong Province on the country’s western coast. South Korea’s Agency for Defense Development (ADD) manages testing at Anheung. A series of still images from the test itself was subsequently posted on the Blue House’s website.

Included in the still image gallery are shots showing the launch of the missile, a formal name for which has not yet been disclosed, from a wheeled transport-erector-launcher on a platform sitting just off the coast. The low resolution of the pictures makes it hard to tell whether the missile and/or the TEL are of an existing South Korean design or are based on one. We will come back to this later on.

As mentioned, there are also pictures of the hypersonic boost-glide vehicle hitting the water. At first glance, the vehicle looks to have a broadly conical design with stabilizing fins at the base. However, at least one of the fins looks to be truncated. Closer inspection of the available images shows further indicators that might point to it actually having a more wedge-shaped design with a distinct top and bottom, though it is still not definitely clear given the low resolution. Conical boost-glide vehicles are generally understood to be easier to design, relatively speaking, than wedge-shaped ones. Historically, hypersonic boost-glide vehicles of any kind have proven to be technically complex and challenging to turn into viable operational weapons, even by countries with extensive past experience with their development.

“This test launch was conducted to verify, for the first time, the vehicle’s core technologies in a hypersonic flight environment: the performance of ultra-high-temperature heat-resistant materials, guidance and control capabilities, and the ability to perform irregular flight maneuvers at low altitudes,” the Blue House said in its release yesterday, per a machine translation of the Korean text. “The HGV [hypersonic boost-glide vehicle] successfully separated after ascending to the target altitude and executed its planned flight path within the hypersonic environment without any issues.”

With all this in mind, the fact that the vehicle just remained intact through to impact is noteworthy. At the time of writing, South Korean authorities do not appear to have disclosed more specific details about the test, including how far the boost-glide vehicle traveled before hitting the water or what peak speed it reached. Important questions also remain about how the vehicle is guided during the mid-course and terminal phases of flight, challenges that do not appear to have been addressed by this particular test.

In general, unpowered hypersonic boost-glide vehicles need to be brought first to an optimal altitude and speed. This is typically achieved using a sufficiently sized rocket booster, with existing ballistic missile designs often serving as a starting point.

Once released from the booster, a boost-glide vehicle flies along a relatively shallow flight path within the Earth’s atmosphere. The vehicle is able to maneuver along the way, sometimes erratically, while traveling at hypersonic speeds, generally defined as anything about Mach 5.

All of this sets hypersonic weapons of this kind apart from traditional ballistic missiles, even ones with advanced maneuverability capabilities, which all follow a broadly arcing trajectory to their targets. The combination of speed, flight trajectory, and maneuverability offered by hypersonic boost-glide vehicles creates distinct challenges for opponents. They are hard to spot and track, let alone attempt to intercept, and there is less time for defenders to react overall. This ability to penetrate enemy air defenses and cover ground rapidly makes these weapons particularly attractive for strikes on very high-value and time-sensitive targets.

“The HGV [hypersonic boost-glide vehicle] is a ‘key strategic asset capable of changing the game on the battlefield,’ as its unpredictable flight trajectory and overwhelming speed allow it to launch surprise strikes against key strategic targets during contingencies,” the Blue House’s release explicitly noted, again according to a machine translation.

With all this in mind, South Korea does have an entire family of domestically-produced ground-launched ballistic missiles that could be suitable starting places for launching an unpowered hypersonic boost-glide vehicle. President Lee was notably shown a TEL for the country’s newest Hyunmoo-5 ballistic missile at Anheung yesterday, though no explicit connection has been drawn between that weapon and the hypersonic test. The Hyunmoo-5 is itself still a relatively new development, having only entered service around the end of last year.

When it comes to new South Korean arms developments, the Hyunmoo-5, which entered service around the end of last year, has been and continues to be a major point of discussion by itself. It is officially categorized as a short-range design, despite how big it is (35 tons gross weight), which is said to be due largely to the equally substantial size of its warhead (17,000 pounds). Past reports have raised the possibility that it could be capable of flying out to intermediate ranges if the warhead weight were reduced. Short-range ballistic missiles are defined as ones with ranges between 190 and 620 miles (300 and 1,000 kilometers), while intermediate-range ballistic missiles can hit targets out to between 1,864 and 3,418 miles (3,000 to 5,500 kilometers). Medium-range ballistic missiles (MRBM) fall in between these two categories.

With its massive unitary warhead, the Hyunmoo-5 already gives South Korea an important new way to hold deeply buried and otherwise hardened targets in North Korea at risk. This fits in directly with the country’s broader Korea Massive Punishment and Retaliation (KMPR) policy, as TWZ has previously written:

“While the Hyunmoo-5 has been widely reported as a future pillar of the KMPR, its specific ability to penetrate deeply buried bunkers, such as those used by the North Korean leadership, the same functions mean that it can also fulfill elements of the ‘kill chain.’ In this way, it could be used as part of a pre-emptive strike, to try and knock out North Korea’s launch capability by targeting its hardened command-and-control facilities and missile storage areas.”

By virtue of the very high speeds they reach in the terminal phase of flight, hypersonic boost-glide vehicles also offer bunker-busting benefits on top of the other aforementioned advantages they bring to the table.

In addition, the hypersonic boost-glide vehicle test reflects a broader arms race that has been expanding in scale and scope for years now. South Korea is also developing an air-breathing hypersonic cruise missile, seen in the composite image below, as well as new air- and sea-launched ballistic missiles, the latter of which will be loaded on new surface warships and submarines.

Though there are always questions about the actual maturity and viability of the designs, North Korea continues to churn out its own new missile developments. This includes two separate test launches of purported new hypersonic designs just in recent weeks. Tit-for-tat missile launches are not entirely uncommon on the peninsula, but there are limits to how quickly a test like the one South Korea conducted yesterday involving an emerging technology can reasonably be staged.

Friction between the North and South has been at a particular high point, in general, following an incident on September 21, in which three South Korean troops were injured along the Demilitarized Zone (DMZ). South Korea’s Joint Chiefs of Staff (JCS), as well as the United Nations Command (UNC) on the Peninsula, have said a North Korean landmine placed in violation of the Armistice Agreement was to blame. South Korean authorities have demanded an apology and raised the prospect of some form of action in response, though President Lee has more recently sought to downplay the situation. The government in North Korea has denied the accusations and threatened an “immediate and powerful counteraction” should South Korea seek to retaliate.

An operational hypersonic boost-glide vehicle capability would also expand South Korea’s capacity to challenge opponents regionally beyond North Korea. Though the regime in Pyongyang represents the most proximate national security threat to the country, China and Russia have also been growing points of concern for South Korean authorities in recent years.

“We must secure our national security through our own strength,” President Lee said after yesterday’s hypersonic test, per the Blue House’s release. “The government must not rest on today’s success but must further advance the technology so that the hypersonic glide vehicle can establish itself as a robust strategic asset safeguarding our future security.”

South Korea’s very public test of its new hypersonic boost-glide vehicle underscores the country’s still-expanding efforts to broaden its options for striking even the best-defended targets in North Korea, as well as projecting power elsewhere regionally. At the same time, it remains to be seen when the South Koreans may field a real operational capability in this regard.

Contact the author: joe@twz.com

The post First Look At Hypersonic Boost-Glide Vehicle Just Tested By South Korea appeared first on TWZ.

Just over two years after the U.S. Air Force retired the last of its KC-10A Extender aerial refueling tankers, four of those aircraft may be bound for a new career in North Africa for a mysterious end user.

The Air Force Life Cycle Management Center (AFLCMC) put out a contracting notice yesterday “solely for information and planning purposes” with the express intent “to identify potential industry sources that possess the capability, expertise, and facilities to execute the regeneration, one-time flight clearance, depot-level return to service, worldwide ferry delivery, in-country Contractor Logistics Support (CLS), and operational/maintenance training for up to four (4) KC-10 Extender aircraft.”

The KC-10s could be “transferred via Excess Defense Articles (EDA) to a partner nation in North Africa,” the notice adds, without naming the country in question.

The Air Force operated KC-10s between 1981 and 2024. TWZ has reached out to the U.S. Air Force, as well as the U.S. State Department, for more information. The State Department directed us to contact the Pentagon.

The EDA program allows for materiel deemed extraneous to U.S. military needs to be transferred to allies and partners either at a reduced cost or as a grant. The foreign nation in question has to pay for those assets to be delivered, as well as refurbishment, if applicable.

It is important to note here that the Extender, as designed, is capable of refueling receivers using either the boom or the probe-and-drogue method. Tankers equipped for the probe-and-drogue method are, by far, more common internationally. We will come back to this later on.

While we don’t know what the North African country might be in line now to receive the quartet of KC-10s, Egypt and Morocco would seem to be the most likely candidates based on their current and planned aircraft inventories. They are also both major U.S. allies.

The Egyptian Air Force currently does not operate any dedicated aerial refueling tankers. The country is in the process of acquiring two new C-130J-30 Hercules aircraft for use as airlifters, as well as tankers, using the probe-and-drogue method. It does already fly C-130s, but none explicitly configured for aerial refueling duties. Egypt also has a very diverse array of fighters that includes U.S.-made F-16 Vipers that can only be refueled in mid-air via boom.

Morocco’s Air Force also flies F-16s and is in the process of acquiring more. The first new-production Block 72 F-16D for the Moroccan Air Force just flew for the first time earlier this week. Morocco does have an organic aerial refueling capability now, but in the form of C-130s equipped to dispense fuel via probe-and-drogue.

As mentioned, the KC-10 was designed to connect with receivers via probe-and-drogue, as well as boom, and could be used to refuel other tactical jets in Egyptian or Moroccan service. As an aside, fighters belonging to both regularly receive foreign tanker support during exercises, as already seen earlier in this story. Just last month, Chinese YY-20 tankers (also sometimes referred to as Y-20Us) notably did just this in an exercise in Egypt.

Footage released by Egypt’s official authorities from the “Eagles of Civilization 2026” joint air exercise shows Egyptian **MiG-29M/M2s and Rafale fighters receiving aerial refueling from a Chinese Y-20 tanker aircraft. pic.twitter.com/pvxkpsDHxG

— 笑脸男人 (@lfx160219) September 7, 2026

Whichever country may be in line to receive the four KC-10s, there is a question about the current state of those aircraft. Earlier in this story, we talked about the Extender’s capabilities as designed.

McDonnell Douglas (since absorbed into Boeing) delivered a total of 60 KC-10s to the U.S. Air Force between 1979 and 1987. The Extender was derived from the three-engine DC-10 airliner, the last of which was produced in 1989. The Air Force lost one of its KC-10s in an accident in 1987.

Of the remaining 59 KC-10s, 10 were put up for auction in a non-flyable state last year. For reasons that remain unclear, a single engine had been removed from under one of the wings of each of those aircraft. These Extenders were also among the first to be retired, and their booms had been stripped to be used as spares for the examples that remained in service until 2024. Private aerial refueling contractor Omega Air looks to have subsequently won those auctions. Omega also operates two ex-Dutch KDC-10 tankers, which are broadly similar to the KC-10, as well as another DC-10 converted into a probe-and-drogue-only tanker. The company has several Boeing 707-based tankers, as well.

The condition of the remaining 49 Extenders is unclear. Congress included a provision in the annual defense policy bill, or National Defense Authorization Act (NDAA), for the 2026 Fiscal Year that required the Air Force to preserve remaining retired KC-10s, but only stipulated they be maintained “in the same storage condition” they were in as of September 30, 2025. The bill, which was signed into law in December 2025, also made clear that the Air Force could still “dispose” of the aircraft in accordance with existing property management statutes.

Regenerating military aircraft, especially larger ones, back to service can be costly, complex, and time-consuming, even when they are kept in storage in a highly maintained state. In this particular case, acquiring KC-10s via the EDA program, with a very low up-front purchase price, could still be attractive to the right buyer, especially compared to the cost of acquiring new-production tankers.

For a country like Egypt or Morocco that has never operated a boom-equipped tanker, second-hand Extenders could be a valuable entry point to future aerial refueling capabilities, as well. In general, organic aerial refueling capability is an important force multiplier for any air arm.

There is a possibility that KC-10s could be regenerated not as tankers, but as cargo aircraft, though this seems less likely to be the case. Cargo carrying was also an important duty for the Extenders while in U.S. Air Force service, and they still could operate in this role even when returned to service as tankers.

Though the aging KC-10s were getting increasingly more difficult to operate and maintain, the Air Force’s decision to retire them was still controversial. The Extender was a highly flexible tanker that could carry more fuel than the KC-46s that supplanted them. Clearly, there are others still interested in operating them.

It should be stressed that the AFLCMC contracting notice does not present the transfer of the four KC-10s as a done deal. At the same time, it has revealed that one of America’s partners in North Africa could breathe new life into four of these retired tankers.

Contact the author: joe@twz.com

The post Retired KC-10 Extender Tankers Could Get A Second Life With North African Mystery Operator appeared first on TWZ.

Standing on the deck of the aircraft carrier USS Abraham Lincoln, Secretary Pete Hegseth looked up at the flattop’s superstructure and got a good indication of many of the targets the Lincoln Carrier Strike Group (CSG) destroyed during its six-month fight with Iran. In a photograph shared by the Pentagon’s image distribution site, Hegseth is seen examining a wall of so-called kill marks stenciled onto the superstructure.

By our count from the image and a video taken during Hegseth’s visit, both of which you can see below, there are 103 one-way attack (OWA) drone kill marks and 34 ship kill marks. These represent the number of each the CSG took out. It is unclear whether there are other kill marks we can’t see.

Though they resemble Shahed-136s, which are the most notorious of Iranian OWA drones, these silhouettes would represent all types shot down, and Iran has many. The same holds true for the ships. The photograph shows stencils of frigates or corvettes but these would be a generic symbol for surface craft kills.

To the sailors of the USS ABRAHAM LINCOLN—

WELCOME HOME pic.twitter.com/AoQymN2yfZ

— Secretary of War Pete Hegseth (@SecWar) October 7, 2026

On board to welcome the ship and its crew as it headed back to its home port of San Diego after a tumultuous and historic deployment, Hegseth extolled the strike group’s accomplishments. Reading from the Presidential Unit Citation awarded to the strike group for its work during Epic Fury, Hegseth noted that it shot down 77 one-way unmanned attack drones and sank 64 Iranian vessels between the start of Epic Fury on Feb. 28 until it departed the region on Aug. 22.

The Lincoln CSG also conducted 3,693 combat sorties, delivered 1.37 million pounds of ordnance, launched 450 Tomahawk Land Attack Cruise Missiles (TLAMs), destroyed 21 anti-ship cruise missiles and defended against four fast-attack craft and explosive-carrying wooden sailing vessels.

Defense Secretary @PeteHegseth awards Presidential Unit Citation to USS Abraham Lincoln pic.twitter.com/DbS5YYu9oB

— CSPAN (@cspan) October 7, 2026

It is unclear at the moment why there are at least 26 more drone kill marks stenciled onto the Lincoln than the number of drones shot down listed in the unit citation and why there are 30 fewer ship kill marks than the tally noted in the citation. The Pentagon referred us to the Navy, and we are waiting for a response from the service.

There is a long tradition of kill marks being stenciled onto aircraft, vessels and other military equipment indicating the destruction of enemy equipment.

Kill marks on aircraft embarked aboard Lincoln indicate that the carrier strike group also destroyed several Iranian submarines and other weapons. These were not listed in the unit citation or in any kill marks stenciled onto the Lincoln that we could see.

An image provided to TWZ by aviation photographer Jeff Rojas, who goes by the handle @jro_photography on Instagram, shows a submarine kill mark on one of the F/A-18F Super Hornets of the U.S. Navy’s Strike Fighter Squadron 41 (VFA-41), the “Black Aces.” That is one of the aviation squadrons embarked on the Lincoln during Epic Fury.

Iranian naval vessels, including the country’s Russian-made Kilo class and other submarines, were top-priority targets during Epic Fury. The U.S. military has previously confirmed that air-launched AGM-114 Hellfire laser-guided missiles (likely fired from MQ-9 Reaper drones) and ground-launched Army Tactical Missile System (ATACMS) short-range ballistic missiles were employed against submarines, specifically.

In total, VFA-41 alone launched 421 missiles and bombs during its time supporting Operation Epic Fury. You can find the details in our story about the squadron here.

In addition, an image published by The Aviationist showed “an extraordinary array of target markings on a VMFA-314 F-35C, apparently representing an oil tanker, three submarines, a surface combatant, a Shahed-type drone, an artillery piece, and several ground-based launchers.”

Marine F-35C Also Sports Three Submarine Kill Markings After Operation Epic Fury

An exclusive image obtained by The Aviationist reveals an extraordinary array of target markings on a VMFA-314 F-35C, apparently representing an oil tanker, three submarines, a surface combatant, a…

— The Aviationist (@TheAviationist) October 5, 2026

It should also be noted that some of the drone kill marks seen on the Lincoln could have been the result of shootdowns by the carrier’s escorts. The Arleigh Burke class guided missile destroyers USS Frank E. Petersen Jr, USS Spruance and USS Michael Murphy all serve as critical air defense platforms for the carrier strike group. Those vessels were also the ones launching the TLAMs, as well as potential submarine involvement.

Late Thursday morning local time, Lincoln finally returned home. The carrier departed San Diego on Nov. 21, 2025, and an arrival closed out a total deployment of 321 days, by our count. That’s just shy of the 326-day record USS Gerald R. Ford set in May, representing the second-longest deployment in the modern carrier era.

USS Abraham Lincoln returns to San Diego https://t.co/0eEnTqJZdU

— Reuters (@Reuters) October 8, 2026

In addition to racking up successes against Iran, the marathon deployment drew scrutiny over the grueling conditions sailors and Marines experienced aboard. In August, crew families described supply shortages and difficult living arrangements, as TWZ reported at the time. The accounts led to widespread media coverage, which Acting Secretary of the Navy Hung Cao called dishonest while also acknowledging that “a small number of mental health cases were treated with no loss of life, meal plans were adjusted when fresh resupply was unavailable, without a single meal being missed, calls home were limited when the operational threat was too high.” At least eight personnel across the strike group attempted suicide during the cruise, Cao wrote in a letter sent to Sen. Kirsten Gillibrand that was obtained by CNN.

The kill mark stencils weren’t the only symbols of Lincoln’s deployment. On Wednesday, Hegseth used symbology to push back against concerns raised about the long journey.

“There were a few folks in the media who tried to turn the USS Abraham Lincoln into some sort of a symbol,” Hegseth said. “A symbol of dysfunction, or a symbol of low morale, or a symbol of a failed mission. And what I look out right here or when I talk to your leadership, and I haven’t had a chance to talk to a number of you, I know it’s the exact opposite.”

UPDATE: 5:59 PM Eastern –

After the Lincoln pulled into its home port, new images emerged. The following picture shows additional kill marks, including 10 of submarines.

Contact the author: howard@twz.com

The post USS Abraham Lincoln Comes Home With Its Island Superstructure Covered In Kill Marks appeared first on TWZ.

The United States is stepping up its campaign to sell Portugal the F-35. Speaking in Lisbon today, Secretary of State Marco Rubio said the United States would make Portugal a “very competitive” offer to replace its F-16 fleet. The development adds a high-level political push to an increasingly intense competition over the Portuguese Air Force’s next fighter.

Portuguese Foreign Minister Paulo Rangel said after meeting Rubio that Lisbon is seriously considering the American proposal, while emphasizing that other options remain under consideration.

“The Portuguese state will always decide in ‌accordance ⁠with the national interest,” Rangel said at a news conference after the meeting. “There is one point that is also clear: we are seriously considering the F-35 proposal, just as we are considering ⁠others.”

Portugal currently operates 25 modernized F-16AM/BMs, including 21 single-seat F-16AMs and four two-seat F-16BMs, from Monte Real Air Base, or BA5. The Portuguese Air Force, known as the Força Aérea Portuguesa (FAP), has not yet formally launched a replacement competition, but the aging fleet is increasingly becoming the focus of attention in Lisbon.

Portugal acquired a total of 45 F-16A/B Block 15 aircraft through the Peace Atlantis I and II programs.

The first 20 aircraft were delivered beginning in 1994. These were new-build F-16A/B Block 15OCU aircraft, comprising 17 single-seat F-16As and three two-seat F-16Bs, and were used to equip Esquadra 201 “Falcões.”

A second batch followed in 1999, when Portugal received 25 former U.S. Air Force Block 15OCU aircraft. Twenty-one were F-16As and four were F-16Bs, with several intended as attrition replacements or spares. These aircraft had accumulated roughly 3,000 flight hours and underwent an extensive modernization program to bring them to the F-16AM/BM configuration. This means the aircraft are broadly comparable to the U.S. Air Force’s F-16C/D Block 50/52 fleet. 

Esquadra 301 “Jaguares” finally became operational with its upgraded aircraft in 2005, while Esquadra 201 did not receive its upgraded F-16s until 2011.

Since then, the Portuguese Vipers have continued to receive incremental improvements. Their configuration has progressed through several mission-software standards, while the aircraft have been equipped with night-vision goggles, Joint Helmet-Mounted Cueing Systems (JHMCS), and advanced targeting and weapons capabilities.

Among the more important additions are Northrop Grumman Litening II targeting pods, and the ability to employ weapons including GBU-12 Paveway II laser-guided bombs, GBU-31 Joint Direct Attack Munitions (JDAM), and GBU-49 Enhanced Paveway II dual-mode weapons.

Twelve former Portuguese F-16s were transferred to Romania under a deal signed in 2013, with deliveries taking place in 2016 and 2017. Romania subsequently ordered five additional aircraft in 2019.

Structurally, the Portuguese F-16s could potentially remain in service into the mid-2040s. But maintaining their relevance against increasingly sophisticated air forces would require continued investment in avionics, sensors, communications, and self-protection systems.

The F-16AM/BM fleet continues to rely on the old AN/APG-66(V)2 pulse-Doppler radar. Replacing it with an active electronically scanned array (AESA) radar such as Northrop Grumman’s APG-83 would substantially improve detection and tracking performance, but would come at considerable cost.

Portugal faces a choice between continuing to invest in increasingly tired fourth-generation airframes or moving directly into the fifth generation.

Since the end of the Cold War, Portugal has become much more engaged in out-of-area operations and missions in support of NATO.

In the process, the Portuguese F-16 fleet has accumulated an impressive operational record.

The fighters have repeatedly deployed on NATO air-policing missions, including rotations to the Baltic States, Iceland, Romania, and Poland.

The F-35A would give Portugal a fifth-generation fighter built around low observability, sensor fusion, advanced electronic warfare, and networked operations.

The aircraft would also fit naturally into a NATO environment in which an increasing number of European air forces are adopting the F-35.

More than 900 F-35s are already in service or on order across Europe, according to previous comments by U.S. Ambassador to Portugal John Arrigo. Washington has repeatedly argued that joining that community would provide Portugal with a substantial interoperability advantage.

However, European competition includes the Eurofighter Typhoon, Dassault Rafale, and Saab Gripen E, with Airbus preparing an especially aggressive campaign for the Typhoon.

Airbus has said it intends to submit an unsolicited Eurofighter proposal to Portugal in late October or early November. That package is expected to encompass not just the aircraft, but financing, industrial participation and broader military cooperation.

Selecting the American stealth fighter deepens Lisbon’s military relationship with Washington at a time when European governments are wrestling with fundamental questions about their dependence on U.S. military capabilities.

Across the continent, uncertainty over Washington’s stance on NATO is encouraging European allies to examine ways of reducing their reliance on American military technology, even as those same countries continue to increase defense spending and purchase U.S. equipment.

If Washington can combine the F-35’s capability advantages with an attractive acquisition and sustainment package, Portugal could find itself facing a difficult choice between the strategic benefits of joining Europe’s growing F-35 fleet and the industrial and political advantages of selecting a European fighter.

The final decision on the replacement of the F-16 will also determine what combat jet spearheads the Portuguese Air Force for the next several decades.

Contact the author: thomas@thewarzone.com

The post U.S. Makes F-35 Push As Portugal Weighs F-16 Replacement appeared first on TWZ.

Shield AI says it is on track to roll out the first prototypes of its X-BAT jet-powered stealth ‘fighter’ drone by the end of this month. Flight testing of this uncrewed aircraft, which is designed to take off and land vertically from a tail-sitting position, is still scheduled to kick off before the end of the year. X-BAT’s core concept was already highly ambitious, but an extremely aggressive timeline to reach some degree of operational capability through the U.S. Navy’s Runway Independent Maritime Expeditionary Strike (RIMES) program has now been disclosed.

TWZ got an update on X-BAT, which we were first to report on in-depth last year, in an interview yesterday with Shield AI’s Armor Harris, Senior Vice President and General Manager of the company’s aircraft division. This came ahead of today’s announcement that the company has received an additional $150 million in funding from the Office of the Under Secretary of War for Acquisition and Sustainment through its Defense Exportability Features program via the Navy. This is on top of the $50 million investment the Navy, in cooperation with the Pentagon’s Defense Innovation Unit, made in X-BAT’s development earlier this year as part of the RIMES effort. Shield AI has committed an equivalent amount of internal funding, for a combined total of $400 million.

“In broad strokes, the last year has been a bunch of collaborative risk reduction with the Navy. So, wind tunnel testing, engine testing, thermal testing, all kinds of stuff to basically take the major risks in the program, [and] burn them down, so we can move confidently into the production design,” Shield AI’s Harris told us. “The last culmination of the risk reduction is the flight testing of the two full-scale prototypes. The first one of those will be done at the end of October.”

“That’s a full-scale vehicle,” he continued. “It’s got the outer mold line, it’s got the F110 engine, the full propulsion path, everything in it.”

To date, Shield AI has only shown models of the X-BAT publicly. A new one displayed at the Navy League’s Sea-Air-Space 2026 exposition in April revealed major changes to the core design. This included a complete reworking of the planform from a ‘cranked kite’ type arrangement to one with a distinctly different arrowhead-shaped profile featuring a straight leading edge with a more dramatic sweep.

The video below includes clips showing the original X-BAT design and the current one.

The aforementioned “propulsion path,” testing of which has already been conducted on the ground, primarily consists of the General Electric F110 paired with an Axisymmetric Vectoring Exhaust Nozzle (AVEN). The nozzle was originally developed in the 1990s for an experimental thrust-vectoring F-16 fighter. Shield AI is using the original AVEN, which had been in storage for decades, to support development of X-BAT. The nozzle will provide pitch and yaw control, with roll control for the drone coming from bleed air routed through thrusters in the drone’s wings.

No runway, no problem.

Shield AI and @GE_Aerospace just cleared a critical path to vertical flight, completing engine light-off testing of the Axisymmetric Vectoring Exhaust Nozzle (AVEN) for X-BAT.

Engineers from both companies integrated the AVEN into GE Aerospace's… pic.twitter.com/OxV3y3sRKB

— Shield AI (@shieldaitech) July 20, 2026

Shield AI has previously said that the roughly fighter-sized X-BAT will have a maximum range of 2,000 nautical miles and a service ceiling of around 50,000 feet. The company has also said in the past it is targeting an effective combat radius roughly twice that of the F-35, or around 1,340 nautical miles, but also that it could be closer to 1,000 nautical miles. Space has been made within the X-BAT design for a potential in-flight refueling capability, but there is no active work yet to integrate that feature.

In terms of payload, X-BAT’s design includes internal weapons bays roughly the same size as those on the F-35, as well as two external hardpoints under the wings. Those hardpoints are plumbed, meaning that range-extending drop tanks, or even buddy refueling stores to allow the drone to act as a tanker, could be carried. Baked-in modularity and open-architecture mission systems are intended to make it easier to fit various sensors, data links, and other capabilities down the line.

“X-BAT’s really designed to be a multi-role capability, and, if you look out at the 10-20 year time horizon, it’s hard to predict what the future fight is going to look like,” Shield AI’s Harris noted. “We fundamentally believe that multi-role capabilities are critically important. And, so, X-BAT, the reason why it’s sized to where it is is [sic] to be able to carry serious strike weapons internally and externally, in addition to being able to do air-to-air [combat], electronic warfare, and other mission sets.

“You could think of it as like X-35 versus F-35,” he also said yesterday when asked about any expectations now for further changes between the initial pair of prototypes and the final production design.

Lockheed Martin’s X-35 demonstrators are, in very broad strokes, similar to, but distinct from any of the resulting variants of the Joint Strike Fighter. Shield AI has notably already talked in the past about integrating more low-observable (stealthy) attributes to the exhaust end of the design down the line.

“Then we’ll get into flight testing around the end of this year,” Harris added. “We’ll be doing vertical takeoff and landing testing with that [the initial prototypes] to actually prove out and develop the VTOL [vertical takeoff and landing] technology for X-BAT.”

Shield AI’s X-Forge 2 facility at the Newton City-County Airport in Kansas is set to be the main flight testing hub for X-BAT, as well as the focal point for sustainment of the drones. A production facility, X-Forge 3, is also being built in Des Moines, Washington. The company’s original site, X-Forge 1, is in Frisco, Texas.

In terms of the actual flight test campaign, “you remember the X-BAT system has the air vehicle and the launch and recovery vehicle, which is the trailer that it launches and lands from,” Harris said. “Basically, the way the testing works is, we start with the vehicle horizontal, sitting on that launch and recovery vehicle, running the engine. Then we bring it up vertical, run the engine vertically, run the vehicle vertically.”

“Then we have one of the biggest cranes in the world that’s getting set up at our test site in Kansas right now, and we hang the vehicle suspended from that crane and do a bunch of testing while it’s hanging from the crane in free flight,” he continued. “Then we take the crane away, and then we do the actual untethered flights.”

Shield AI’s goal is to fly a fully missionized X-BAT in 2028 and start series production the following year.

On top of that, “the way that the [RIMES] program has been structured is getting to an early operational capability in 2029 is the end goal,” Shield AI’s Harris said.

When asked if this meant that RIMES is aiming “to eventually arrive at not just a demonstration of capability, but a real operationalized capability,” he said that was “correct.”

We will come back to this more later on, but suffice it to say up front, the prospect of X-BAT reaching an operational level of maturity within three years is extraordinarily ambitious, to say the least.

In the meantime, Shield AI has already been testing the mechanisms to “latch and unlatch” X-BAT to the launch and recovery system using an unpowered “battleship” test article, according to Harris. The design of the launch and recovery system has also evolved, and it is now self-propelled, at least to a degree, rather than just being a towed trailer.

“The launch and recovery vehicle is actually critical to the operation of the X-BAT weapon system because it enables survivability on the ground. So when you’re operating in a land-based environment, it enables basically shoot-and-scoot tactics,” Harris also noted. “Enemy transporter-erector-launchers [for missiles] are like pretty hard to find because they’re constantly moving around. Just like X-BAT, when it’s mated onto the launch and recovery vehicle, [it] is always moving around, makes it hard to track, hard to find, hard to destroy.”

The plan now is to “build the one-to-one launch and recovery vehicles to air vehicles. So the air vehicle is always on the trailer. It never comes off of it,” he continued. “Even maintenance to the air vehicle is done while it’s sitting on that launch and recovery vehicle.”

“In fact, we’re actually planning on building more than one-to-one of the launch and recovery vehicles, so that way you can preposition them around different islands, different places in the theater, and have multiple places the aircraft can lily pad from,” he added. “But you’re never putting multiple aircraft onto one launcher and launching them or something like that.”

“When you typically operate a jet, there’s a whole bunch of ground carts and stuff that you bring, like the ground power cart, the ground cooling cart, the air start cart, etc,” Harris further elaborated. “So we’ve moved a lot of those systems onto [the] launch and recovery vehicles, so you don’t have all these separate carts, which is pretty critical when you’re trying to do expeditionary operations.”

“The model for land-based operations is kind of a hub-and-spoke type model. So the squadrons are based at air bases. All the fuel and the weapons are generally based at the air bases, as well. But then you can distribute the aircraft all over the airfield,” he continued. “So, you think about what the enemy’s doing, they’re targeting the runways, they’re targeting the tarmacs, but you can disperse the aircraft around the perimeter of the airfield. You can launch them from the golf course. You can launch them from empty space in the taxiway, etc.”

Harris said that another “spoke” could be X-BATs operating from forward arming and refueling points (FARP). All of this is part of larger concepts of operations for the drone that Shield has been envisioning, and that are not at all limited to deployments at locations on land. Harris noted during the interview that the self-propelled nature of the current launch and recovery system would also help with moving the drones around on virtually any ship with sufficient deck space. This is where the RIMES program, which is separate and distinct from the U.S. Navy’s carrier-based Collaborative Combat Aircraft (CCA) drone ambitions, really comes in.

“I’ll say the fundamental value proposition of RIMES is that if you have a carrier-based CCA, you’re fundamentally constrained by the square footage of the deck of the aircraft carrier,” Harris explained. “So if you are taking an F-18 or an F-35 off, you better be replacing it with better capability per square foot of deck space than the thing that you’re taking off.”

“So, F/A-XX [the Navy’s sixth-generation carrier-based fighter, now to be built by Boeing] is a huge leap in capability, right? Which is why that program makes a lot of sense,” he continued. “The challenge with CCA is: Does it really make sense to take a manned aircraft off of an aircraft carrier and replace it with an unmanned aircraft?”

Shield AI’s argument here is that X-BAT disrupts this core equation by opening the door to a CCA-like capability, or even something more capable, that can be employed in a ship-based mode without sacrificing any crewed aircraft capacity on an aircraft carrier. Shield AI envisions dozens of X-BATs being employed from amphibious assault ships, as well as other kinds of amphibious warfare ships, including expeditionary sea base type vessels, as seen at the top of this story.

“So when you think about the number of carrier air wings that the Navy has to deploy, deploying X-BAT across all these other ships basically significantly increases the number of carrier air wings,” Harris said.

As already mentioned, the current structure of the RIMES includes a target for an early operational capability in 2029, according to Harris. “We have a program defined to get there, and there’s basically milestone-based payments along the way, so as Shield performs and hits milestones, then the Navy kicks in additional funding,” he added.

“I don’t want to get ahead of the Navy, and give you a specific number, but like hundreds to low thousands,” he also said when asked if there was even a very rough planning figure for the eventual size of the RIMES drone fleet.

Many questions remain about X-BAT, which still has to demonstrate the viability of its vertical takeoff and landing capability, which underpins everything else. As we noted in our original in-depth report on this design, the core concept here is not new, and there have been many unsuccessful attempts to operationalize it in the past. There has been skepticism that Shield AI’s effort will succeed where others have failed. The company is of the view that groundwork has now been more firmly laid, including through its own work with its much smaller internal combustion-engine-powered V-BAT tail-sitting VTOL drone, to truly realize a design of this kind.

The performance and capabilities that Shield AI expects from X-BAT once it is flying at all are also ambitious. A high degree of autonomy is also part of the full planned package, which will leverage the company’s already extensive work in this domain with its Hivemind software.

There are also questions about the Navy’s exact plans for RIMES, as well as its broader future drone fleets. Just this year, the service has issued several contracting notices pointing to rapidly evolving views about future carrier-based strike drones and other uncrewed aircraft. New requirements that Naval Air Systems Command (NAVAIR) released in August ostensibly for future CCA-type drones notably pointed more toward something that sounded very much like an advanced uncrewed combat air vehicle (UCAV), as you can read more about here.

Whether the 2029 operational timeframe the Navy is said to be aiming for under RIMES is firm, or even realistic in any way, remains to be seen. The actual definition of what constitutes an “early operational capability” could be very flexible, as well. It is also worth noting here that Shield AI is not the only company currently conducting work under RIMES. Whether the Navy might be planning to acquire more than one design through this program is unclear. We have reached out to the service for more information.

Other services could be interested in any operational capability produced through the RIMES effort, too. TWZ regularly highlights how runway-independent drones would be particularly well-suited to the U.S. Marine Corps’ new expeditionary and distributed concepts of operations. That service is already in the process of acquiring MQ-58B Valkyrie drones from Kratos that will be able to operate from conventional runways. They will also be capable of runway-independent launches, though they will still have to land conventionally. The baseline Valkyrie design lands via parachute.

Aviation Week has reported separately today that Shield AI is looking to pitch the X-BAT to the U.S. Army as a successor to that service’s fleet of MQ-1C Gray Eagle armed drones.

In general, runway independence is of growing interest elsewhere across the U.S. military as threats to large, established bases continue to expand in scale and scope. The proliferation of various tiers of weaponized drones is a particularly significant factor in this, as TWZ just examined in detail this week in the context of the recent withdrawal of B-1 bombers from RAF Fairford in the United Kingdom. Ever more capable cruise, ballistic, and hypersonic missiles are also part of the full threat picture.

The conflict with Iran has also underscored the limits of what can be gained survivability-wise by dispersing traditional fixed-wing aircraft, especially within an existing airbase. As highlighted earlier, X-BAT could be dispersed very differently to nearly anywhere within a facility that can handle the thrust from the F110 engine in hover.

As it stands now, we are set to get our first view of a full-sized X-BAT prototype within the next few weeks as Shield AI continues to gear up for the start of actual flight testing before the end of the year.

Contact the author: joe@twz.com

The post Navy Doubles Down On X-BAT VTOL ‘Fighter’ Drone Development appeared first on TWZ.

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