Production. A-31 ("Vengeance") dive bombers. Pattern-making drop-hammer die. This worker is making a pattern for a drop-hammer die for the forming of a sheet-metal part for the "Vengeance" dive bombers manufactured at Vultee's Nashville Division. The "Vengeance" (A-31) was originally designed for the French. It was later adopted by the RAF (Royal Air Force) and still later by the U.S. Army Air Forces. It is a single-engine, low-wing plane, carrying a crew of two men and having six machine guns of varying calibers