Douglas ZB-18A 39-25 United States Air ForceThese are 1 72 scale decals for Douglas ZB 18A 39 25, United States Air Force an aircraft with one of the most extraordinary biographical histories of any surviving American military aircraft. The B 18 Bolo was the Douglas entry that won the 1935 USAAC bomber competition over the Boeing Model 299 the aircraft that would eventually become the B 17 Flying Fortress. Built in 1939 for the U. S. Army Air Corps, 39 25 was eventually transferred to the Cuban