Photograph of a SPAD XIII aircraft (tail number S16541, fuselage number 25) of the 22nd Pursuit Squadron, U.S. Army Air Service, circa 1917-1920s. The squadron's "shooting star" emblem is visible on the fuselage.Caption on envelope: "SPAD XIII / 22nd…
Photograph of a Curtiss OX-5 aircraft (tail number 22677, fuselage number 22693), circa 1918. Caption on envelope: "Standard J Curtiss Model OX-5 / 1918."