The Sikorsky MH-53 Pave Low series is a retired long-range special operations and combat search and rescue (CSAR) helicopter for the United States Air Force. The series was upgraded from the HH-53B/C, variants of the Sikorsky CH-53 Sea Stallion. The HH-53 Super Jolly Green Giant was initially developed to replace the HH-3E Jolly Green Giant. The U.S. Air Force's MH-53J/M fleet was retired in September 2008.[1]