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"  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].
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