The F3H Demon was the first swept-wing jet fighter designed by McDonnell Aircraft and the only single-engine carrier-based fighter built by the company. The F3H-2N Demon, first ordered in 1956, was designed as a strike fighter. It was armed with four Sparrow radar-guided missiles or two Sidewinder heat-seeking missiles and four 20 mm cannons, or up to 6,000 pounds of conventional bombs. McDonnell Aircraft delivered the last of 522 Demons in 1959 and they remained in squadron service until 1964.