在美国,武装直升机概念萌芽于20世纪40年代,但一直到50年代中才正式进行研制试验。4年后,美国国防部批准了陆军对直升机加装武器的要求,陆军航空兵由此便走上一了条逐步发展壮大的道路。 In the United States, the concept of armed helicopters sprouted in the 1940s, but it was not until the 1950s that formal tests were conducted. Four years later, the U.S. Department of Defense approved the Army’s request for the helicopter to retrofit its weapons. As a result, Army Aviation embarked on a path of gradual development.