The A-10 Thunderbolt II is a single-seat, twin-engine jet aircraft created to provide close environment help (CAS) of ground forces by attacking tanks, armored automobiles, with ground objectives. As another objective, it provides airborne forward environment control, leading other aircraft against ground objectives. Oahu is the very first United States Air Force aircraft developed entirely for CAS. A -10A : Single-seat close environment assistance,ground-attack variation.