F5D-1 SkylancerThe big block letters "TEST" on the upper fuselage of this Douglas F5D-1 Skylancer (Bu. No. 139208/NASA tail number 212)...F5D Skylancer in flight (copy negative).F5D Skylancer with camera installation in nose.F5D Skylancer NASA 212 modified as the X-20 Dyna-Soar vision field simulator.F5D Skylancer taxis in after a mission.