In 1965, during the Vietnam war, the outstanding load ability of this CH-47 Chinook led the U.S. Army to request a heavily armed variation to be able to provide support the AH-1 Cobra. Initial journey happened on 6th November of the identical year and, in May 1966, four samples of these hefty Chinooks, assigned to the 1st Air Cavalry Division, had been stationed on An Khe base for studies. As a result of hefty armaments, including a 40 mm XM-5 grenade launcher, two 20 mm M-24 cannon, five 12.7 mm M-2 device guns and two hook-up points for rocket launchers or other loads-plus hefty armour to shield both crew and helicopterthe ACH-47 proved highly effective in a ground troop help part. Nonetheless, due to the complexity for the aircraft therefore the pushing significance of transport variations of the Chinook, the U.S. Army halted any more development.
