The first F-15EX Eagle II destined for permanent assignment at Kadena Air Base in Okinawa departed Boeing’s St. Louis, Missouri, facility on August 28, 2026. The aircraft left St. Louis for the 142nd Wing at Portland Air National Guard Base, Oregon, where it will undergo final staging and integration preparations before its eventual deployment to the sprawling Okinawa installation it will call home. The Oregon unit is acting as a coordination and preperation unit for the 18th Wing, a function you can read more about in our interview with the wing’s commander.

This departure represents a critical, long-awaited milestone for the 18th Wing, which has been working toward the permanent stationing of the service’s most advanced Eagle variant to replace its now-withdrawn F-15C/D fleet. The arrival of the F-15EX in Japan, expected to begin in fiscal year 2027, which begins on October 1, 2026, will be a central pillar in the Air Force’s modernization of tactical airpower in the Indo-Pacific region.

EXciting progress for F-15EX!

We've delivered the 22nd F-15EX to the @usairforce. The aircraft will be the first F-15EX destined for @KadenaAirBase in Japan. pic.twitter.com/RlrTKuCCFl

— Boeing Defense (@BoeingDefense) September 3, 2026

“This is an important next step toward bringing the F-15EX home to Kadena,” said Brig. Gen. John Gallemore, 18th Wing commander, in an Air Force release. “Our team is ready to welcome the F-15EX, and this is another milestone that brings us closer to putting this capability in the hands of the airmen who will fly, maintain and employ it from Japan.”

The first F-15EX for Kadena’s 18th Wing, serial 22-0022, was noted flying test sorties from St. Louis in early August, initially in primer paint. By the middle of the month its was flying with its full livery, including the famous “ZZ” tail code.

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The F-15EX is a significant jump in capability over the legacy Eagles. With modernized avionics, flight controls, an expanded electronic warfare suite, and increased weapons carriage — as well as potentially new and longer-reaching weapons — the jet is well-suited to operating in the vast Western Pacific. As Kadena prepares for the permanent arrival, the 18th Wing plans to integrate the EX with regional allies, including the Japan Air Self-Defense Force, building upon existing bilateral training exercises.

Two active-duty squadrons of F-15EXs are set to be established at Kadena, taking the place of units previously based there that had flown F-15Cs. The Air Force has been deploying F-15Es, F-22s and other fighters to the base on a rotational basis to fill the gap in the meantime.

The F-15EX will give U.S. forces in the Indo-Pacific a high-capacity platform that complements the fifth-generation F-22 and F-35. With its ability to carry large air-to-air and air-to-surface payloads, the Eagle II can serve as a long-range “missile truck,” extending the reach and firepower of stealth aircraft operating closer to contested airspace. Its open-architecture systems also allow it to incorporate new sensors, weapons, and electronic warfare capabilities more readily than the aging F-15C/D fleet.

The aircraft’s value is also tied to its role in networked operations. Exercises such as Valiant Shield have demonstrated how the F-15EX can work with uncrewed aircraft like the  MQ-28 Ghost Bat, pointing toward mixed formations in which crewed fighters provide weapons, sensing, and command-and-control capacity for autonomous wingmen. Operating from strategic locations such as Kadena, the Eagle II could help the Air Force generate more combat power across the vast Pacific while reducing the burden on its limited number of stealth fighters.

Kadena will become the second Air Force location with combat-coded F-15EX aircraft, following the Oregon Air National Guard’s 142nd Wing.

The Air Force has previously announced plans to stand up National Guard F-15EX squadrons in California, Louisiana, and Michigan. Most recently, the Air Force announced plans to put F-15EX fighters at Seymour Johnson Air Force Base, North Carolina, to replace older F-15E Strike Eagle jets that will move to Whiteman Air Force Base, Missouri.

While the movement of this first Kadena-bound F-15EX is a positive step, the wider Eagle II program is currently navigating some issues. According to a new Pentagon selected acquisition report released in August, the Air Force’s decision to aggressively expand its F-15EX fleet from 129 to 267 jets — intended to recapitalize the older F-15E force — has introduced substantial cost and schedule uncertainties that officials are now scrambling to manage.

The report warns that the extended acquisition strategy, which shifted from eight production lots to 12, will require Boeing to execute a “major technical refresh” to combat diminishing manufacturing sources and material shortages. As systems like the radar, mission computer, and engines face potential obsolescence over the now-lengthened production timeline, the service faces what the report characterizes as a “significant redesign effort.” Program managers are planning to mitigate these risks by integrating upgrades through operational flight program releases scheduled between 2031 and 2035, a strategy they describe as a “structured, risk-reduced pathway” to avoid production line gaps.

Compounding these technical challenges are tangible production delays, largely stemming from a labor strike at the St. Louis plant from August to November 2025. The report notes that these are “unrecoverable delays,” forcing a cascading schedule slip. While Boeing was contracted to deliver all 12 jets from Lot 3 by early 2026, the company will only be able to field half of those by the end of the year. This has directly impacted the timeline for the Kadena deployment, which was originally envisioned for earlier in 2026, and has left the Air Force relying on “bridging strategies” and rotations to cover operational requirements until the Eagle IIs can fully stand up in Okinawa.

The Pentagon is now moving toward an aggressive production ramp-up, tasking Boeing to hit a rate of two jets per month. Keeping the F-15EX schedule on track will be a challenge, however, requiring successfully navigating ongoing parts shortages for critical systems, all while balancing the needs of foreign military sales customers who are also integrated into the supply chain.

For the 18th Wing, the arrival of the first F-15EX will bring a major advance in capabilities in a part of the world that needs them badly. At the same time, the program’s overall trajectory suggests that the wider transition to the new Eagle will come with some complex logistical and industrial challenges.

Contact the author: thomas@thewarzone.com

The post First USAF F-15EX To Be Based In Japan Departs Boeing’s St. Louis Plant appeared first on TWZ.

The United Kingdom is moving toward adding a flying-boom aerial refueling capability to the Royal Air Force (RAF), a requirement being driven in large part by the future Tempest combat jet, being developed under the Global Combat Air Program (GCAP) initiative.

In a written response to opposition MP Ben Obese-Jecty, U.K. Defense Minister Luke Pollard confirmed that the RAF’s existing probe-and-drogue aerial refueling capability will eventually be complemented by a boom system. The move would give Britain a sovereign capability to refuel aircraft equipped with the U.S.-standard boom receptacle, including the Tempest, while also improving interoperability with other NATO and allied air forces.

“The Royal Air Force currently operates a probe and drogue air-to-air refueling system and will complement this with the development of a boom system,” Pollard said. “This will ensure we have a sovereign air-to-air refueling capability for the future Royal Air Force fleet that enhances interoperability with NATO allies and partners.”

For the first time we have a Minister confirming the Boom is coming to Royal Air Force tankers, although the when and the how currently remain very much up in the air.

Still significant to have it through government voices and not just through the RAF itself. pic.twitter.com/esRN7NVoPy

— Gabriele Molinelli (@Gabriel64869839) September 2, 2026

The decision follows comments by a senior RAF official in July indicating that the service was already examining how to meet the requirement.

“We currently do not have boom [-equipped tankers] in the UK. We have a requirement for a boom from GCAP, so we have to resolve that requirement and that is what we are now looking at,” the official said at the Air Power Association Global Air and Space Chiefs’ Conference in London, according to Janes. “I [am] certain that at some point we are going to have to work out how we deliver a sovereign boom capability for our own combat aircraft.”

The requirement is particularly significant because GCAP’s Tempest is being designed with a fuselage-mounted receptacle for boom refueling. Unlike the probe-and-drogue arrangement used by the RAF’s existing Voyager tankers, a flying boom uses a rigid, telescoping refueling tube that is maneuvered by an operator aboard the tanker into the receiver aircraft’s receptacle.

One of the major advantages of the boom system is its higher fuel-transfer rate. That makes it especially useful for large aircraft and combat aircraft that need to take on substantial quantities of fuel quickly, reducing the time spent on the tanker.

Tempest is not, however, the only RAF aircraft that depends on the boom standard. The RAF already operates several boom-equipped receiver aircraft, including P-8A Poseidon maritime patrol aircraft, RC-135W Rivet Joint intelligence, surveillance, and reconnaissance aircraft, and C-17A Globemaster III airlifters. The E-7A Wedgetail airborne early warning aircraft also uses a boom receptacle, while the forthcoming RAF F-35A fleet will add another major boom receiver to the service.

Currently, the RAF has no boom-equipped tanker to support them.

Its principal tanker fleet consists of Airbus A330 Multi-Role Tanker Transport (MRTT) Voyager aircraft operated by the AirTanker consortium and leased to the RAF under a private finance initiative. Unlike many A330 MRTT operators around the world, which acquired the aircraft with a flying boom, the British Voyagers were configured exclusively around hose-and-drogue refueling.

The Voyager K2 is equipped with two wing-mounted Cobham 905E hose-and-drogue refueling units. The K3 adds a third refueling point in the form of a Cobham 805E fuselage refueling unit, or FRU, located at the rear of the aircraft. The latter provides a higher fuel-transfer rate than the wing-mounted units.

Since the fuel is stored in existing tanks, the Voyager’s cabin is still available to accommodate up to 291 passengers and the cargo hold for freight. One Voyager, serial ZZ336, nicknamed Vespina, is modified for long-range VIP transport but still functions as a fully capable tanker.

A video showing Voyager ZZ336 refueling RAF and German Eurofighter Typhoons during the enhanced Air Policing mission in Romania:

Up to 14 Voyagers are available to the RAF under the current arrangement.

The future of those aircraft is now one of the key questions surrounding Britain’s planned boom capability.

One possibility would be to modify some of the existing Voyagers, installing a boom system in the rear fuselage. The baseline Airbus’ A330 MRTT design already incorporates a provision for a flying boom. At the time the United Kingdom ordered its Voyagers, boom refueling was not considered essential, so the capability was deleted to save weight, complexity, and cost — a decision which was to prove very shortsighted.

Such a conversion, however, would involve engineering, certification, ownership, and contractual considerations, particularly given that the RAF does not directly own the Voyager fleet.

Britain could also decide that modifying the existing aircraft is not worthwhile. The current Voyager private-finance arrangement runs until 2035, by which point the airframes will be considerably older. Rather than investing heavily in aircraft approaching the end of their contracted service period, the government could opt to acquire new A330 MRTTs or another tanker type equipped with a boom from the outset.

Another, more remote possibility could involve a podded boom arrangement, a concept that has been around for a while now, but which is gaining traction with the U.S. Air Force as it weighs options for future tanker capabilities. 

It remains unclear, however, whether a podded boom would offer the performance and integration characteristics required for Tempest and the RAF’s wider fleet. There is also a question about what platform it could be installed on.

At the same time, TWZ has previously highlighted how drones equipped with buddy stores could operate in a hub-and-spoke model, ferrying fuel from tankers positioned outside the threat envelope to aircraft operating at the tactical edge. This could be another option that might gain traction as the U.K. Ministry of Defense increasingly looks to unlock the potential of uncrewed capabilities, but must also be considered less likely, especially as a primary solution.

There is also a potential requirement for the tankers themselves to be capable of receiving fuel. Equipping a tanker with a receiver system would allow tanker-to-tanker refueling, extending the flexibility and reach of the RAF’s future air-to-air refueling force during long-range operations. Other A330 MRTT operators already benefit from this feature.

While Tempest is providing the immediate catalyst, a refueling boom capability would also close an increasingly conspicuous gap in the RAF’s tanker force. The service is acquiring and operating an increasing number of aircraft built around the boom standard while relying on a tanker fleet configured around the alternative hose-and-drogue system.

Whether Britain modifies its existing Voyagers, replaces them, or adopts another solution entirely could become an important part of the RAF’s long-term force structure as the Tempest program advances.

Contact the author: thomas@thewarzone.com

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