Navy Adm. Mike Mullen, left, chairman of the Joint Chiefs of Staff, and Defense Secretary Robert M. Gates, right, greet Sen. Joseph I. Lieberman and Sen. Carl Levin before a Senate Armed Services Committee hearing on operations in Libya at the Dirksen Senate Office Building in Washington, D.C., March 31, 2011. DOD photo by Petty Officer 1st Class Chad J. McNeeley

From left to right, Sens. Joseph Lieberman, Carl Levin and John McCain listen to Defense Secretary Robert M. Gates and Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, testify about operations in Libya during a Senate Armed Services Committee, Dirksen Senate Office Building, Washington, D.C., March 31, 2011. DOD photo by Petty Officer 1st Class Chad J. McNeeley

U.S. Marine Corps Sgt. Gabriel Ledesma, left, delivers the game ball to Washington Nationals' opening day starting pitcher Livan Hernandez at Nationals Park in Washington, D.C., March 31, 2011. Ledesma and several other wounded warriors and Iraq and Afghanistan war veterans participated in the Nationals' 2011 season opener against the Atlanta Braves. DOD photo by Army Sgt. 1st Class Michael J. Carden

U.S. Air Force Commander Lt. Col. Andy Veres and Provincial Reconstruction Team Zabul senior engineer Capt. Christopher Bulson talk with a sub-contractor of the Daychopan district school, Zabul, Afghanistan, March 29, 2011. The school, currently under construction, should be completed this summer. U.S. Air Force photo by Staff Sgt. Brian Ferguson

Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, testifies at a hearing of the House Armed Services Committee on operations in Libya at the Rayburn House Office Building in Washington, D.C., March 31, 2011. DOD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

Defense Secretary Robert M. Gates, left, and Navy Adm. Mike Mullen, right, chairman of the Joint Chiefs of Staff, testify at a hearing of the House Armed Services Committee on operations in Libya at the Rayburn House Office Building in Washington, D.C., March 31, 2011. DOD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

U.S. Marine Corps Lance Cpl. Seth A. Peikert ensures chains and straps are properly secured during a mission to move an 11,500-pound Bobcat on Camp Bastion, Afghanistan, March 29, 2011. Peikert is a landing support specialist assigned to Helicopter Support Team, Landing Support Detachment, Headquarters and Support Company, 2nd Marine Logistics Group (Forward). U.S. Marine Corps photo by Lance Cpl. Bruno J. Bego

U.S. service members, members of the Japan Self-Defense Force and students of Ishinomaki High School work together to clean the school during Operation Field Day in Ishinomaki, Japan, March 30, 2011. U.S. service members are working with their Japanese counterparts to provide assistance in support of Operation Tomodachi. U.S. Marine Corps photo by Lance Cpl. Matheus Hernandez