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Sigma KEE - Helicopter
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Any Aircraft with rapidly rotating wings.
Parents Aircraft Any Vehicle which is capable of AirTransportation. Note that this class covers both fixed-wing aircraft and helicopters.
Children AH1The Bell AH-1 Cobra, called the Huey Cobra, Cobra, Sea Cobra, or Snake (depending on the model), is an attack helicopter, designed by Bell Helicopter Textron. It shares a common engine, transmission and rotor system with the UH-1. It is now fully replaced by the AH-64 Apache in US Army service, but upgraded versions continue to fly with US Marine Corps, US Navy and several other users. (from Wikipedia)
 CH46DThe CH-46D Sea Knight helicopter is a medium lift tandem rotor assault helicopter, used by the United States Navy for shipboard delivery of cargo, personnel, and search & rescue. The CH-46E is used by the United States Marine Corps to provide all-weather, day-or-night assault transport of combat troops, supplies and equipment. Assault Support is its primary function, and the movement of supplies and equipment is secondary. Additional tasks may be assigned, such as combat support, search and rescue, support for forward refueling and rearming points, aeromedic evacuation of casualties from the field, and recovery of aircraft and personnel. The CH-46 Sea Knight was first procured in 1960 under the old designation of HRB-1 to meet the medium-lift requirements of the United States Marine Corps in all combat and peacetime environments since that time. The final production version was the CH-46F. In all, 524 H-46s were produced for the Navy and Marine Corps. The last Sea Knight rolled off the assembly line in February of 1971. The fleet is currently being maintained until a suitable replacement is approved. On September 24, 2004 the USN retired the type, seeing it replaced by the MH-60 Seahawk. The USMC is replacing its CH-46s with the V-22 Osprey. The first V-22 squadron, HMM-263, will be stood up in March of 2006 and renamed VMM-263. The replacement process is expected to continue through the other medium helicopter squadrons, into 2014. (from Wikipedia)
 CH53EDesignated S-80E internally by the Sikorsky Aircraft Corporation, the Marine Corps CH-53E Super Stallion, and the Navy MH-53E Sea Dragon are the largest and heaviest helicopters in the United States military. The base model CH-53E serves both the Navy and Marines in the heavy lift transport role. It is capable of lifting heavy equipment including the 8 wheeled LAV-25 Light Armored Vehicle (but not the U.S. Army Stryker, which is too heavy), the M198 155mm Howitzer with ammunition and crew, and can recover all other Marine corps aircraft except for the KC-130. The less common MH-53E fills the Navy's need for long range mine sweeping or Airborne Mine Countermeasures (AMCM) missions. It features enlarged side mounted fuel sponsons and is rigged for towing its mine sweeping sled from high above the dangerous naval mines. Currently under development is the CH-53K, formerly known as the Heavy Lift Replacement, which will be equipped with three 6000 shp-class turboshaft engines. (from Wikipedia)

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