Entering service with the U.S. Air Force in 1949, it was designed for intercontinental missions, capable of flying over 10,000 miles without refueling—an unmatched range at the time. Its most distinctive feature was its massive wingspan, the largest of any combat aircraft ever operated, and its unusual propulsion system of six rear-mounted piston engines in a “pusher” configuration, later supplemented by four jet engines for extra speed. 
 
Built to deliver nuclear payloads during the early Cold War, the B-36 could strike targets deep within enemy territory while flying at altitudes beyond the reach of most interceptors of its era.