CH-46 Sea Knight vs CH-47 Chinook

The Vertol Model 107 was developed as the YHC-14 in 1958, in response to a US Army requirement for a medium-size turbine powered helicopter. This effort was cancelled in favor of the larger CH-47 Chinook of the same company. The US marines tested a modified version, the Model 107M, that was soon accepted as the HRB-1, which became in the CH-46.

"Rules of Engagement" [2000] stars Tommy Lee Jones and Samuel L. Jackson and is directed by William Friedkin. Dale Dye is the film's military technical adviser and also appears on screen as a general who gives Childers his support. The screenplay is by Stephen Gaghan from a story by former Marine officer and Secretary of the Navy James Webb. Jackson plays Marine Colonel Terry Childers, who is the commander of a Marine amphibious unit on board USS Wake Island [played in the movie by LHA 1 USS Tarawa], somewhere in the Indian Ocean.

When the US Embassy in Yemen is surrounded by a large crowd of demonstrators, Childers is ordered to lead a squadron of Marines to bolster security at the embassy. The Marines quickly take up positions on the roof of the Embassy in case things take a turn for the worst. The evacuation itself is a tour de force of war-movie filmmaking. The only problem is that the Marines take off in Marine Corps CH-46 Sea Knight helicopters. In the next scene they are flying towards the target and the helicopters have been magically transformed into the Army's CH-47 Chinook [the twin-engine Marine Corp UH-1Ns also suddenly become single-engine Army UH-1Hs].