U.S. soldiers, along with Iraqi police, clear and patrol the town of Aswad in Diyala province, Iraq, Feb. 19, 2008. U.S. Navy photo by Petty Officer 1st Class Sean Mulligan

U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, conducts an all hands call with Joint Staff members at the Pentagon, Washington, D.C., Feb. 28, 2008. Defense Dept. photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, conducts an all hands call with Joint Staff members at the Pentagon, Washington, D.C., Feb. 28, 2008. Defense Dept. photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

Air Force Honor Guard Drill Team members perform their new "four-corners" drill sequence, which represents the global reach of the Air Force, at Union Station in Washington, D.C. Feb. 21, 2008. The "unveiling drill" is the first drill of the year and the formal presentation of the 2008 team. U.S. Air Force photo by Senior Airman Sean Adams

Army Col. Stephen Twitty leads more than 3,000 of his soldiers through the streets of downtown El Paso, Texas, during a Welcome Home Heroes Parade Feb. 27, 2008. Twitty is commander of the 1st Cavalry Division's 4th Brigade Combat Team. U.S. Army photo by Staff Sgt Paula Taylor

The U.S. Navy NASCAR team services the No. 88 Navy Accelerate Your Life Monte Carlo during the Stater Brothers 300 at California Speedway, in Fontana, Calif. Feb. 25, 2008. A late-race transmission failure relegated Navy driver Brad Keselowski to 32nd in the race. U.S. Navy photo by Lt. j.g. Andrea Ross

Defense Secretary Robert M. Gates walks through an honor cordon while departing at the Turkish Ministry of Defense in Ankara, Turkey, Feb. 28, 2008. Defense Dept. photo by U.S. Air Force Tech. Sgt. Jerry Morrison

An Iraqi soldier explains the security situation at a new combat outpost in Al Risala, Iraq, Feb. 21, 2008, to an interpreter for U.S. soldiers assigned to the 3rd Armor Cavalry Regiment's 3rd Squadron. U.S. Army photo by Sgt. Amanda Davis