Army Gen. Martin E. Dempsey, chairman of the joint chiefs of staff, hosted the armed forces farewell ceremony to honor Defense Secretary Leon E. Panetta on Joint Base Myer-Henderson Hall, Va., Feb. 8, 2013. DOD photo by U.S. Army Staff Sgt. Sun L. Vega

A U.S. soldier helps a fellow soldier onto the rooftop of an old, destroyed building to provide overwatch for another element of their patrol in Panjwa’i District, Afghanistan, Jan. 29, 2013. U.S. Army photo by Sgt. Kimberly Hackbarth

U.S. Army Spc. Michael Jones begins a security sweep after dismounting from his tactical vehicle during a mission in Farah City, Afghanistan, Feb. 18, 2013. Jones is assigned to assigned to Provincial Reconstruction Team Farah. U.S. Navy photo by Lt. j.g. Matthew Stroup

U.S. Army Spc. Thaxal Potter provides rooftop security outside a meeting at the Farah provincial governor's compound in Farah City, Afghanistan, Feb. 27, 2013. Potter is assigned to Provincial Reconstruction Team Farah. U.S. Navy photo by Lt. j.g. Matthew Stroup

U.S. Army 1st Lt. Robert Wolfe, left, talks with Afghan students while providing security outside a meeting at the Farah provincial governor's compound in Farah City, Afghanistan, Feb. 27, 2013. Wolfe, a platoon leader, is assigned to Provincial Reconstruction Team Farah. U.S. Navy photo by Lt. j.g. Matthew Stroup

American Idol finalists Diana DeGarmo and Ace Young perform for U.S. sailors during a USO spring tour aboard the aircraft carrier USS John C. Stennis in the 5th Fleet area of responsibility, Feb. 28, 2013. U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, and his wife, Mary, hosted the tour. U.S. Navy photo by Petty Officer 2nd Class Kenneth Abbate

U.S. sailors render honors to U.S. Navy Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, during a USO spring tour visit to the aircraft carrier USS John C. Stennis in the 5th Fleet area of responsibility, Feb. 28, 2013. The Stennis is conducting maritime security operations, theater security cooperation efforts and support missions for Operation Enduring Freedom. U.S. Navy photo by Petty Officer 2nd Class Kenneth Abbate

U.S. Army 1st Lt. Robert Wolfe, right, escorts Jim Otwell, left, a U.S. Agency for International Development field program officer, to the Directorate of Education in Farah City, Afghanistan, Feb. 26, 2013. Wolfe, a platoon leader, is assigned to Provincial Reconstruction Team Farah. The team met with the provincial education director and visited Aboonaser-Farahi High School, Farah City's oldest high school. U.S. Navy photo by Lt. j.g. Matthew Stroup