U.S. Army Sgt. Anthony Scribner demonstrates a slack line rappel. U.S. Army Sgt. Anthony Scribner, an instructor at the Sabalauski Air Assault School, demonstrates a slack line rappel from the school's 34-foot rappelling tower at Fort Campbell, Ky., on Oct. 29, 2007. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 343606-V-RHK39-377.jpg Photo Gallery