Your opportunity to learn a trade Join the Air Service, United States Army.

Your opportunity to learn a trade Join the Air Service, United States Army. LOC Summary: U.S. Army Air Service recruiting poster showing men on an airfield with airplanes flying overhead, and six halftone illustrations of classrooms for the "welding department, motor transport department, practical drafting and blueprint reading, instruction in areo engines, ignition course, and machinists' practice shop.". Date Created/Published: Boston : Forbes, between 1917 and 1920. World War One propaganda poster provided by LOC. Original medium: 1 print (poster) : offset lithograph, color with halftone.