Sikorsky CH-53 USAF helicopter model. US Air Force versions of the CH-53 included the HH-53B, HH-53C and CH-53C Combat Search and Rescue helicopters. Ordered in September 1966, the first flight of the HH-53B ,Stallion ,took place in March 1967. By the end of the year the helicopters were in Vietnam, where they became known as the ,Super Jolly Green Giant. Later versions include the MH-53J and MH-53M ,Pave Low ,that have flown in the Gulf wars. These are low-range, low-level, all weather penetration helicopters flown in support of Special Operations Forces.