USA: Lockheed AH-56 Cheyenne military attack prototype helicopter. #attackhelicopter #helicopter #AH-56 #LockheedCheyenne #LockheedAH-56Cheyenne. Wikipedia web page: https://en.wikipedia.org/wiki/Lockheed_AH-56_Cheyenne. Photo by By William Pretrina on https://en.wikipedia.org/wiki/Lockheed_AH-56_Cheyenne#/media/File:Lockheed_AH-56_Cheyenne.jpg