First of two prototypes. First flew in 1972. No more were built as the USAF chose the Fairchild-Republic A-10 instead. To the Castle Air Museum in 1981 then to the AFFTC Museum, Edwards AFB, CA in 1996.

Preserved at the Castle Air Museum by 1987.

Preserved at the Castle Air Museum from 1983.

Preserved at the Castle Air Museum from 1981.

Delivered to the US Army as L-20 54-1707 in 1956. Redesignated as a U-6A in 1962. Stored at Davis-Monthan AFB, AZ in 1972. Left in 1976, to the US Department of Agriculture as N43862. Preserved at the Castle Air Museum in USAF markings as 54-1707 from 1981.

Preserved at the Castle Air Museum from 1980.

Preserved at the Castle Air Museum from 1984.

Delivered to the USAF as 52-166. To the US Navy and retired at China Lake, CA by 1966. Made the last flight of a B-47 to Castle AFB for the Castle Air Museum in 1986.

Prototype T-34 Mentor. First flew as 50-735 in 1950. To civil registry as N2073A by 1976. To the Castle Air Museum in 1983.

Built as a B-50D. Converted to a WB-50D. Stored at Davis-Monthan AFB, AZ in 1965. Made the last B-50 flight to Castle AFB for the Castle Air Museum in 1980.

Delivered to the USAAF as 44-86891. Stored at Davis-Monthan AFB, AZ in 1957. Sold as N3337G in 1959. Converted to a fire bomber in 1960. To the Castle Air Museum in 1980 and marked as 02344 which was the aircraft Lieutenant Colonel James Doolittle flew on the Tokyo air raid in 1942. Later marked as 891.

Delivered to the USAAF as 44-77575 in 1944. Badly damaged during Operation Varsity, the Rhine crossing in 1945. Repaired and returned to the USA. To the Japan Air Self Defence Force as 51-1124 in 1955. Registered as N54510 in 1978.To the Castle Air Museum in 1982.

Ex USAAF 42-89678.

On display at Museum of Flight. Article 134 is the first of two built in 1963 and the only one to survive a test loss. It was retired after 80 flights. D-21 'Tagboard' drone #510 for unmanned recce is attached to the spine launch pylon. Launch of these drones at M 3.3 by the Launch Control Officer (LCO) seated in the aft cockpit proved difficult. The 13.1 m titanium D-21 with a max weight of 4,990 kg was powered by a Marquart XRJ43-MA-20S4 ramjet engine that could fly the drone in excess of M 3.3 and 80,000 ft for around 90 min. Only the nose section with the cameras and film was recoverable.

A new addition to the museum, receiving some much needed attention having previously being held with another nearby collection at Plobannalec. Last operated by 163 TFS with the Indiana ANG. SOC in 1986 and assigned to Sembach, Germany for Battle Damage Repair frame.