A Curtiss SOC-1 Seagull scout-observation biplane in flight in July 1939. (U.S. Navy Photograph.)
Tag - observation
Curtiss O-52 Owl observation aircraft used by the United States before and during World War II. (U.S. Air Force Photograph.)
Training flight of Douglas O-46A and North American O-47 aircraft assigned to the 104th Observation Squadron of the Maryland National Guard, March 1940. (U.S. Air Force Photograph.)
Maintenance work is performed on a Vought OS2U Kingfisher on a U.S. Navy cruiser off the coast of Japan in March 1945. (U.S. Navy Photograph.)