Boeing CH-47 Chinook camouflage

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The Boeing CH-47 Chinook is an American twin-engine, tandem rotor, heavy-lift helicopter developed by the American rotorcraft company Vertol and manufactured by Boeing Vertol (later renamed Boeing Helicopter and now named Boeing Aircraft Rotor System). The CH-47 is one of the heaviest lifters of the Western helicopter. His name, Chinook, is from the Native American Chinook people of Washington state.
The Chinook was originally designed by Vertol, who began work in 1957 on a new tandem-rotor helicopter, designated the Vertol Model 107 or V-107. Around the same time, the United States Department of the Army announced its intention to replace the piston-powered Sikorsky CH-37 Mojave engine with a new, gas turbine-powered helicopter. During June 1958, the US Army ordered a small number of V-107s from Vertol under the designation YHC-1A; after testing, it was deemed by some Army officials to be too heavy for assault missions and too light for transport purposes. While the YHC-1A was to be upgraded and adopted by the US Marine Corps as the CH-46 Sea Knight, the Army sought a heavier transport helicopter, and ordered an enlarged derivative of the V-107 with the designation Vertol Model 114. Originally designated as the YCH-1B, On September 21, 1961, the preproduction helicopter made its maiden flight. In 1962, the HC-1B was renamed the CH-47A under the 1962 United States Tri-Service aircraft designation system.