U.S. Army 1st Sgt. Randy Hahn clears a spot to set ice screws. U.S. Army 1st Sgt. Randy Hahn with the 4th Brigade, 25th Infantry Division, clears a spot to set ice screws during a crevasse rescue training exercise at the Black Rapids Training Site in Alaska on July 18, 2011. Hahn was a student in the basic mountaineering class at the Northern Warfare Training Center at Fort Wainwright. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 284061-V-DDV49-252.jpg Photo Gallery