Plane-spotters caught something slightly out of place: the U.S. Navy’s premier test and evaluation squadron flying an Air Force jet.

VX-9, the Navy’s “Vampires” at China Lake, was observed operating an F-35A — the conventional, land-based version of the Lightning II usually associated with the Air Force, not the Navy’s carrier-capable F-35C. It’s a small detail with intriguing implications.

One Jet, Three Variants

The F-35 comes in three flavours: the F-35A for conventional runways, the F-35B that can land vertically, and the carrier-optimised F-35C. They share most of their systems but differ in structure and mission. A Navy test squadron flying an A-model most likely reflects joint work — common weapons, sensors or software that need validating across the whole family rather than one service’s jet.

Why Cross-Service Testing Pays Off

With more than a thousand F-35s flying across many nations, anything that can be tested once and applied to all three variants saves enormous time and money. A shared weapon clearance or software build validated by one service benefits everyone. A Navy squadron borrowing an Air Force jet is, in that light, less an oddity than a sign of how integrated the F-35 enterprise has become.

Sources: Army Recognition; U.S. Navy; open-source observation.