Seven Summits
Capt. Rob Marshall, 8th Special Operations Squadron, uses the StairMaster at the Aderholt Fitness Center at Hurlburt Field, Fla., Oct. 28, 2010, while wearing a 60 pound pack in preparation for an upcoming mountaineering expedition to climb Vinson Massif, the highest mountain in Antarctica. Captain Marshall and Capt. Graydon Muller, 6th Special Operations Squadron, depart Nov. 24, 2010 to climb the 16,076 foot mountain as part of the U.S. Air Force Seven Summits Challenge, an effort for Air Force members to climb the highest mountain on each continent. (U.S. Air Force photo by Staff. Sgt. Stephanie Jacobs/RELEASED)