U.S. Air Force pararescuemen fast-rope from a U.S. Army MH-47 Chinook helicopter.
U.S. Air Force pararescuemen with the 321st Special Tactics Squadron fast-rope from a U.S. Army MH-47 Chinook helicopter during insertion training at Jackal Stone 10 at the 21st Tactical Airbase, Swidwin, Poland, on Sept. 14, 2010. The international special operations forces exercise is held annually.