U.S. Air Force H-19 helicopters performed many rescues in Korea including night rescues and rescues behind enemy lines. Others duties included transferring wounded from the field to Mobile Army Surgical Hospital (MASH) units and from MASH units to larger hospitals, and inserting/retrieving Allied agents behind enemy lines. The 3rd Air Rescue Squadron evacuated over 7,000 wounded during the Korean War utilizing both H-5 and H-19 helicopters. They also rescued 170 pilots from behind enemy lines and from the Yellow Sea.