The AH-64 Apache is a four-blade, twin-turboshaft attack helicopter with a tailwheel-type landing gear arrangement, and a tandem cockpit for a two-man crew. It features a nose-mounted sensor suite for target acquisition and night vision systems, armed with a 30mm (1.18in) M230 chain gun, a mixture of AGM-114 Hellfire missiles and Hydra 70 rocket pods. The helicopter was introduced to U.S. Army service in April 1986. 2,000 AH-64s have been produced to date by Boeing Defense, Space & Security. It has also become the primary attack helicopter of multiple nations, including Greece, Japan, Israel, the Netherlands and Singapore.