Defense Secretary Robert M. Gates meets with President Valdis Zalters of Latvia and members of their staffs in the Pentagon, April 24, 2008. Defense Dept. photo by Cherie Cullen

Latvian President Valdis Zalters, right, meets with Defense Secretary Robert M. Gates in the Pentagon, April 24, 2008. Defense Dept. photo by Cherie Cullen

Defense Secretary Robert M. Gates, right, escorts Latvian President Valdis Zalters, left, through an honor cordon upon his arrival at the Pentagon for bilateral defense meetings, April 24, 2008. Defense Dept. photo by Cherie Cullen

U.S. Army Pvt. Juston Grubbs and Sgt. Thomas Tallman review maps and compasses to prepare for a fire exercise at Dillingham Airfield, Hawaii, April 23, 2008. The soldiers area assigned to the 2nd Squadron, 6th Cavalry Regiment, 25th Combat Aviation Brigade. U.S. Army photo by Sgt. Bryanna Poulin

U.S. Navy Petty Officer 3rd Class Matthew Strand, assigned to the "Dusty Dogs" of Helicopter Anti-submarine Squadron, repairs the blades of an SH-60 Seahawk aboard the nuclear-powered aircraft carrier USS Harry S. Truman, April 21, 2008, Persian Gulf. U.S. Navy photo by Petty Officer 2nd Class Pamela Coxe

U.S. Marines from 24th Marine Expeditionary Unit, International Security Assistance Force, NATO, conduct a training exercise that requires them to meet with local people and earn their trust, Kandahar, Afghanistan, April 15, 2008. U.S. Marine Corps photo by Cpl. Andrew J. Carlson

Airman Kelvin Brown cleans the canopy of an F/A-18C Hornet assigned to Strike Fighter Squadron 195 aboard the aircraft carrier USS Kitty Hawk , April 21, 2008. Brown, a plane captain, is in charge of performing maintenance on an aircraft once it has landed. U.S. Navy photo by Seaman John J. Mike

U.S. Navy Petty Officer 3rd Class Mason Flynn dangles from the safety winch of an SH-60F Seahawk helicopter during an air show for the crew of the nuclear-powered aircraft carrier USS George Washington, Pacific Ocean, April 20, 2008. U.S. Navy photo by Petty Officer 2nd Class Clifford L. H. Davis