The B-10 was the first all-metal monoplane bomber produced in quantity, featuring such innovations as retractable landing gear, a rotating gun turret and enclosed cockpits. This B-10 was an export version sold to Argentina in 1938 and is the only remaining example left of the type. In 1970 the Argentinian Govt. kindly donated the aeroplane for display at the National Museum of the USAF.