The U.S. Marine Corps’ newest helicopter, the CH-53K, completed its first external load flight test carrying a 20,000 lb. load May 26 at Sikorsky Aircraft Corporation’s Development Flight Center in West Palm Beach, Fla. Envelope expansion tests will continue with incrementally increasing speeds with the 20,000 load, and then on to the CH-53K’s requirement, a 27,000-pound external payload.