"Jabit III" was originally assigned the Victor (unit-assigned aircraft identification) number 1 but on August 1 was given the large 'A' tail markings of the 497th Bomb Group as a security measure and had its Victor number changed to 71, to avoid misidentification with actual 497th BG aircraft. "Jabit III" was used by the group commander, Col. Paul Tibbets, on July 24 and 25 to drop two dummy Little Boy atomic bomb assemblies into the ocean off Tinian to test fire their radar altimeter components.