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Hartley Soule with Fairchild 22, Langley Field, Virginia, USA, April 25, 1932. American aerospace engineer Hartley Soule stands in front of a Fairchild 22 monoplane with a leading edge high lift device installed for flight testing. This was the first of three Fairchild 22s to be used by the NACA at Langley. This Fairchild 22 showed no aircraft number in the NACA shield on the rudder, although as the NACA fleet expanded, the number appearance became a requirement. Hartley Soule with Fairchild 22, Langley Field, Virginia, USA, April 25, 1932. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)