Alabama. No. 6 66-8831 is on display at Fort Campbell. No. 7 66-8832 is on display at the Army Aviation Museum, Fort Rucker. No longer on outdoor display. Specifications (AH-56A) See also References Notes Citations Bibliography Apostolo, Giorgio. The Illustrated Encyclopedia of Helicopters. New York: Bonanza Books. 1984. . Bonin, John A., MAJ, USA. Towards the Third Dimension in Combined Arms: The Evolution of Armed Helicopters into Air Maneuver Units in Vietnam . Fort Leavenworth, Kansas: US Army Command and General Staff College, 22 April 1986. Campbell, Douglas. The Warthog and the Close Air Support Debate. Annapolis, MD: Naval Institute Press, 2003. . Dahl, Arden B. The Warthog. The Best Deal the Air Force Never Wanted. paper. National War College. 2003. Government Accounting Office. Staff Study: Advanced Attack Helicopter. Washington, D.C.: Government Accounting Office, 1974. pdf. Accessed 31 October 2008. Landis, Tony and Jenkins, Dennis R. Lockheed AH-56A Cheyenne – WarbirdTech Volume 27, Specialty Press, 2000. . Office of the Assistant Vice Chief of Staff of the Army (OAVCSA). An Abridged History of the Army Attack Helicopter Program . Washington, DC: Department of the Army. 1973. Robb, Raymond L. "Hybrid helicopters: Compounding the quest for speed", Vertiflite. Summer 2006. American Helicopter Society. External links Assault Helicopters. U.S. Centennial of Flight Commission web site Shrader, Cecil L., COL (Ret.), USA. "Attack Helicopter Transformation". Letter to the editor. Army Magazine. January 2003. Association of the United States Army. "Attack Helicopter Evaluation, AH-56A Cheyenne Compound Helicopter". U.S. Army, June 1972. AH-56A pictures and specs H-056 Cheyenne 1960s United States attack aircraft 1960s United States helicopters United States military helicopters Cancelled military aircraft projects of the United States Compound helicopters Rigid rotor helicopters Single-turbine helicopters Aircraft first flown in 1967 Attack helicopters