Helicopter flight controls blades collectively ("i.e.," all at the same time) and independent of their position. Therefore, if a collective input is made, all the blades change equally, and as a result, the helicopter increases or decreases its total lift derived from the rotor. In level flight this would cause a climb or descent, while with the helicopter pitched forward an increase in total lift would produce an acceleration together with a given amount of ascent. The collective pitch control in a Boeing CH-47 Chinook is called a "thrust control", but serves the same purpose, except that it controls two rotor systems, applying
Armed helicopter and support them on the ground. They were used successfully during the Scud Hunt. Other Army Special Operations include the MH-6 and AH-6 "Little Birds". The MH-6 carries special operators on benches outside the helicopters, from which they can move quickly. The AH-6 is for close air support. The MH-47 Chinook helicopter has been used to carry special operators using long-wheelbase Land Rovers and other vehicles in and out of an area of operations. For longer-range special operations, the Air Force had operated the MH-53 Pave Low helicopter with extensive avionics for navigation, flying at very low altitude, and electronic