A U.S. Special Forces soldier returns from leading a patrol of Afghan commandos during an operation in the Khogyani district in Afghanistan's Nangarhar province, March 21, 2014. U.S. Special Forces Soldiers advised and assisted the commandos during an operation to disrupt insurgent movement. The soldier is assigned to Combined Joint Special Operations Task Force Afghanistan. U.S. Army photo by Spc. Connor Mendez

Air National Guardemen and members of the Everett Fire Department remove trees and debris to allow water to drain from the area to enable them to search for survivors in Oso, Wash., March 28, 2014, following a deadly mudslide. Washington National Guard photo by Army Staff Sgt. Rory Featherston

Air Force Staff Sgt. Jonathon Hernas carefully maneuvers across debris and mud while searching for survivors in Oso, Wash., March 28, 2014, following a deadly mudslide. Hernas is assigned to the Washington National Guard's 141st Civil Engineer Squadron. Washington National Guard photo by Army Spc. Matthew Sissel

Defense Secretary Chuck Hagel answers questions from reporters during a press conference at the Pentagon, March 31, 2014. Hagel discussed ongoing efforts to recover American service member remains from past conflicts and took questions about provocative actions by North Korea and the situation in Ukraine. DOD photo by Glenn Fawcett

Defense Secretary Chuck Hagel answers questions from reporters during a press conference at the Pentagon, March 31, 2014. Hagel discussed ongoing efforts to recover American service member remains from past conflicts and took questions about provocative actions by North Korea and the situation in Ukraine. DOD photo by Glenn Fawcett

U.S. Army Gen. Martin E. Dempsey, left, chairman of the Joint Chiefs of Staff, answers questions from the press with the Old City of Jerusalem in the background, March 31, 2014. DOD photo by D. Myles Cullen

U.S. Army Gen. Martin E. Dempsey, foreground, chairman of the Joint Chiefs of Staff, tours the Konrad Adenauer Conference Center in Jerusalem, March 31, 2014. DOD photo by D. Myles Cullen

U.S. Army Gen. Martin E. Dempsey, left, chairman of the Joint Chiefs of Staff, meets with U.S. Marines at the U.S. Consulate in Jerusalem, March 31, 2014. DOD photo by D. Myles Cullen