The Sikorsky CH-53K King Stallion is a heavy-lift cargo helicopter manufactured by Sikorsky Aircraft for the United States Marine Corps (USMC). The King Stallion is an evolution of the long running CH-53 series of helicopters which have been in continuous service since 1966. It is built to thrive on the modern battlefield, including maritime operations. This helicopter is ingenious, reliable, low-maintenance, and survivable in the most distant and austere forward operating bases. Moreover, it is known as the modern solution for true heavy lift and heaviest helicopter in the U.S. military.