The AH-64A/D Apache and AH-64E Block III Apache Longbow (renamed Guardian) are four-blade twin-engine attack helicopters manufactured by Boeing. The Apache was originally developed by Hughes Helicopters in the 1970s (first flight on September 30, 1975), however, the company was acquired by McDonnell Douglas in 1984. In 1997, McDonnell Douglas merged with Boeing. The latest variant, the AH-64E Apache Guardian helicopter (originally designated AH-64D Block III), is powered by two General Electric T700-GE-701D turboshaft engines with 1,994 shp each. The AH-64D/E models are based on the original AH-64A, which was deployed in 1984 and first used in combat in 1989...