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.