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. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 855087-K-YYJ59-134.jpg Photo Gallery