Ex N2566B, USAF 48-626, but painted as 48-622. This was the military version of the Northrop N-23 Pioneer. Twenty were built but were found to be underpowered, and were soon used as ground instruction airframes. They were sold off in 1955 to civil users, and this one went to Mexico as XA-LOU before going to the museum in the early 1990s.