Sikorsky's CH-53 series began as a large heavy-lift helicopter and grew into more powerful versions, with the CH-53E Super Stallion adding a third engine and greater lift capability, and the later CH-53K King Stallion reaching a gross takeoff weight of over 84,000 pounds, nearly twice that of the CH-53A. First evaluated by Naval Air Test Center personnel in August 1965, the CH-53A could perform loops and rolls and was for a time the world's fastest production helicopter. Variants in the CH-53 series perform mine countermeasures and special operations missions, can be refueled in flight, and are operated by the U.S. Navy, U.S. Marine Corps, U.S. Air Force, and many foreign militaries. Bureau Number 151686, the third CH-53A produced, served with Marine Helicopter Squadron HMH-363 from 1968 until 1971, then transferred to the Naval Air Development Center in Warminster, Pennsylvania, where it helped develop Forward Looking Infra-Red and Night Vision systems for safe low-altitude night operations before being retired in 1991 and transferred to PRNAM.