Based on the Super Jolly Green Giant, the Sikorsky MH-53M Pave Low IV is a massive, grim-looking special-operations helicopter. It flew with the U.S. Air Force from 1967 to 2008, an impressive 40 years of military service, before being replaced by the Osprey tiltrotor. At nearly 90 feet long with a 72-foot rotor, it is one of the largest helicopters to have been in U.S. military service. For their special missions, Pave Low IV helicopters were equipped with advanced sensor/electronics systems and three machine guns.
Pave Low IV 68-10357 participated in Operation Ivory Coast, the 1970 mission to rescue American POWs from Son Tay prison in Vietnam, and is now on display at the National Museum of the United States Air Force (Wright-Patterson AFB, Dayton, Ohio). Transformers fans might recognize the Pave Low IV as Blackout and Grindor from the Michael Bay movies. Neither Decepticon fared terribly well; Blackout got shot by Captain Lennox and Grindor got his head pulled in two by Optimus Prime.