Photo may be at Grey Field, near Fort Lewis, Washington where the 91st was posted in 1936. Photo from: The Early Aviation Photograph Collection/The Museum of Flight

The O-46, which entered service in 1936, was overtaken by the need for observation aircraft to be nimble, small and able to use rudimentary airfields. The O-46 was a large, lumbering aircraft that would have been a sitting duck for fighters. A few were in the Philippines at the start of the Pacific war in 1941 but mostly they were US based with the Air National Guard or on mundane utility work. Photo by: Rudy Arnold / Smithsonian Institution

Two-seat closed cockpit parasol-winged observation monoplane, the only survivor of 90 built for the USAAC from 1935. Crashed at Harlingen TX 27.11.42 and remains retrieved in 1967 and restored for display.