The AH-64 Apache is an all-weather ay-night military attack helicopter and is the United States Army's principal attack helicopter, and is the successor to the AH-1 Cobra. The AH-64 is a twin-engined helicopter with four-bladed main and tail rotors. It has a crew of two which sit in tandem. The main fixed armament is a 30 mm M230 Chain Gun, it is also able to carry a mixture of AGM-114 Hellfire and Hydra 70 rockets on four hard points mounted on its stub-wing pylons.