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 IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 855087-K-YYJ59-134.jpg Photo Gallery