Col. Paul Sheppard (right), Joint Task Force Support Forces Antarctica deputy commander, welcomes Secretary of the Navy Ray Mabus and Lt. Gen. Hawk Carlisle to McMurdo Station, Antarctica, Feb. 2, 2010. Secretary Mabus and General Carlisle, 13th Air Force and JTF SFA commander, visited with scientists and engineers working in Antarctica, as well as the U.S. military personnel supporting their logistical requirements as part of Operation Deep Freeze. JTF SFA, led by 13th Air Force at Joint Base Pearl Harbor Hickam, Hawaii, wrapped up the most recent ODF season Feb. 24, 2010. (U.S. Navy photo/Mass Communication Specialist 2nd Class Kevin S. O'Brien)