The JB-3 Tiamat was subsonic air-to-air missile program that began in January 1944 for the U.S. Army Air Force under project MX-570. Prime contractor was Hughes Aircraft Company Electronics Division which developed the Tiamat with the assistance of the National Advisory Committee for Aeronautics, (NACA). Tiamat was propelled by a rocket motor of a boost-sustain dual-thrust type, providing 7,200 lbf (32 kN) of thrust for 3.5 seconds, followed by 200 lbf (0.89 kN) for 45 seconds of cruising flight at 600 miles per hour (970 km/h). Tiamat used semi-active radar homing radar guidance to intercept the target aircraft, with a proximity fuze to detonate the missile's 100 lb (45 kg) High Explosive warhead when within lethal range of an enemy aircraft. The JB-3 program was quickly reduced in status