Sikorsky delivered a 20th CH-53K® helicopter to the U.S. Marine Corps in September 2025. The heavy lift helicopter will be based at Marine Corps Air Station (MCAS) Yuma, Arizona. Photo courtesy Sikorsky, a Lockheed Martin company. CH-53K® helicopters on final assembly at Sikorsky Aircraft headquarters in Stratford, Conn. The helicopters are in production, leveraging the company's digital build and advanced technology production processes. Photo courtesy Sikorsky, a Lockheed Martin company. Accessibility Sta ...