The Marines are in the sixth-generation fighter business. Quietly, without fanfare, the Marine Corps included a post-2041 sixth-generation combat aircraft in its 2026 Aviation Plan — the first time the service has formally acknowledged that it wants a successor to the F-35. A top Marine general offered the clearest public description yet: whatever the Marines build will probably look something like the Navy’s F/A-XX. Not identical. Not a carbon copy. But similar — a fast follower that leverages the Navy’s investment while adapting the airframe for Marine Corps operational concepts.

The Quiet Entry

When the Marine Corps published its 2026 Aviation Plan in February, most analysts focused on the immediate priorities — F-35 Block 4 upgrades, MV-22 sustainment, the CH-53K ramp-up. Buried deeper in the document was a small but significant nod to a future sixth-generation fighter requirement. The Deputy Commandant for Aviation has since confirmed that the service is beginning to explore what it might want in a future crewed combat aircraft. The emphasis is on exploring. The Marines are not rushing to issue a formal requirement. They are watching what the Air Force does with the F-47 and what the Navy does with the F/A-XX, and positioning themselves to follow quickly once those programmes mature. A senior Marine general put it plainly: sixth-generation fighters are primarily an Air Force mission. The Marines will augment the fifth-generation force with a sixth-generation element when the technology is ready and the operational need is clear. That timeline is approximately 2041 — five to ten years after the service completes its transition to an all-Block 4 F-35 fleet, which itself is roughly a decade away.

The Drone Bridge

Between now and 2041, the Marines plan to use Collaborative Combat Aircraft — autonomous wingman drones — as the bridge to sixth-generation capability. CCAs will fly alongside F-35s, extending the manned fighter’s sensor reach, weapons load, and survivability without requiring a new manned platform. This is not a holding pattern. The Marines see CCAs as a proving ground for the autonomy, artificial intelligence, and network technologies that will define sixth-generation warfare. By the time the service is ready to commit to a crewed sixth-gen fighter, the autonomous systems that will accompany it will already be combat-tested. The Marine Corps’ approach reflects institutional pragmatism. The F-35B — the short-takeoff-and-vertical-landing variant that operates from amphibious assault ships and austere forward bases — is the most expensive and most complex version of the Lightning II. Developing a Marine-specific sixth-gen fighter from scratch would be prohibitively costly. Following the Navy’s lead, adapting the F/A-XX design for Marine requirements, is the only financially realistic path.

What “Something Like the F/A-XX” Means

The general’s comment that a Marine sixth-gen fighter would probably look something like the F/A-XX is revealing. It implies that the Marines anticipate a carrier-capable, stealthy, long-range platform — not a specialised STOVL variant like the F-35B. This raises questions. The Marine Corps has built its entire force structure around the ability to operate from amphibious ships and expeditionary airfields. A conventional carrier-launched fighter would require the Marines to operate from Navy carriers or from long, prepared runways — a departure from the distributed, austere-basing concepts that define Marine aviation. The alternative is that the Marines are keeping their options open. A sixth-gen fighter that borrows the F/A-XX’s stealth, sensors, and weapons architecture but incorporates a different propulsion or launch system — perhaps leveraging VTOL technologies being developed for programmes like the X-BAT — would be the best of both worlds. For now, the Marines are doing what Marines do best: watching, learning, and preparing to move fast when the moment arrives.

Sources: Breaking Defense, The War Zone, Air & Space Forces Magazine, Militarnyi