The Fairchild Republic A-10 Thunderbolt II is a single-seat, twin-engine jet aircraft designed to provide close air support of ground forces by attacking tanks, armored vehicles, and other ground targets. It is the first US Air Force aircraft designed exclusively for close air support. The A-10 was developed in response to the increasing vulnerability of ground attack-planes to ground air defenses. This indicated the need for a specialized, heavily armored aircraft with long loiter time and large ordnance load, much like the Ilyushin Il-2 or A-1 Skyraider.