 The Cheyenne program was canceled by the Secretary of the Army on 9 August 1972. The helicopter's large size and inadequate night / all-weather capability were reasons stated by the Army for the cancellation. The Cheyenne's analog and mechanical weapons systems were becoming out of date as new digital systems that were more accurate, faster, and lighter were being developed. The Cheyenne's unit cost had increased and was likely to increase further if new avionics were incorporated.
