The Sikorsky CH-53K King Stallion is a large, heavy-lift cargo helicopter currently being developed for the United States Marine Corps. The design features three engines, new composite rotor blades, and a wider aircraft cabin than previous CH-53 variants. It will be the largest and heaviest helicopter in the U.S. military. Two hundred helicopters are planned to be delivered at a total cost of over $25 billion. Ground Test Vehicle (GTV) testing started in April 2014 with flight testing to start in 2015.
Expeditionary in nature, the CH-53K aircraft will be fully shipboard compatible and capable of operating from austere and remote forward operating bases. The CH-53K helicopter is the Marine Corps' critical land and sea based logistics connector.