Modified as HARV (High Alpha Research Vehicle) testbed.

This 1976 YF-18A is the 6th McDonnell Douglas built single seat prototype and was delivered to the US Navy on 31 Jan'80 with code 6 to the Naval Air Test Center, NAS Patuxent River (MD). It served the NATC up to 22 Oct'84 when it was transferred to NASA. Initially it carried its BuNo and "NASA 840", in 1985 it received registration N840NA. The Hornet was used from 1987-1996 as a High Alpha Research Vehicle with thrust-vectoring vanes, research flight control system and forward fuselage strakes. Since 2003 it is preserved at the Virginia Air & Space, Hampton (VA). Here pictured at Dryden FRC.