Truman Library photo of President Truman signing proclamation for Air Force Day on August 1, 1947, celebrating 40th anniversy of founding of Air Force.  Air Force photo.  Gen. Jimmy Doolittle seated left.  Air Force Secretary Stuart Symington seated right.  Gen. Hoyt Vandenberg standing left.  Gen. Lauris Norstad standing right.  Photo was taken July 10, 1947 at about 12:30 p.m.