Martin B-10

The Martin B-10 is a bomber designed by the Glenn L. Martin Company that entered service in June 1934 as the first all-metal monoplane bomber regularly used by the United States Army Air Corps. It began as the private venture Model 123, which first flew on 16 February 1932, and its closed cockpits, rotating turret, retractable landing gear, internal bomb bay and full engine cowlings became the standard for bomber design worldwide. Martin won the 1932 Collier Trophy for the XB-10. A total of 348 were built, with the United States and the Netherlands the largest users, and the airframe served as the basis for the B-12, B-13, B-14, A-15 and O-45.