An Iraqi national police instructor gives Col. Ted Martin, commander of the 1st Brigade Combat Team, 4th Infantry Division, an overview of a mechanics class that is taught at the Joint Security Station Jazeera in southern Baghdad, March 24, 2008. U.S. Army photo by Spc. Nathaniel Smith

A Paladin fires its 155mm Howitzer from Badoush Prison near Mosul to expose enemy movement, March 29, 2008. The Howitzer belongs to Howitzer Battery, 3d Armored Cavalry Regiment from Fort Hood, Texas. U.S. Army Spc. John Crosby

U.S. Army 1st Lt. Bryan Diminico, right, takes down information with a translator, Spc. Simon Nbyenye, from an orchard farmer in al Buaytha, March 25, 2008. Diminico is a platoon leader assigned to the 1st Platoon, Company D, 1st Battalion, 30th Infantry Regiment. U.S. Army photo by Sgt. Kevin Stabinsky

Aircraft fly in formation over the Nimitz-class aircraft carrier USS Abraham Lincoln during an air power demonstration in the U.S. 5th Fleet area of responsibility, March 30, 2008. U.S. Navy photo by Airman Ashley Houp

Marines assigned to the "Red Devils" of Marine Fighter Attack Squadron 232 clean an F/A-18A Hornet on the flight deck of the nuclear-powered aircraft carrier USS Nimitz, March 29, 2008, in the Western Pacific. U.S. Navy photo by Mass Communication Specialist 3rd class Eduardo Zaragoza

U.S. Navy Lt. Sara Nelson, center, a medical officer assigned to the 11th Marine Expeditionary Unit, examines a patient during a medical civic action program in Goubetto, Djibouti, March 30, 2008. U.S. Air Force photo by Tech. Sgt. Jeremy T. Lock

Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, listens to an Arabic translation by Army Sgt. 1st Class Robert Morris at the U.S. Army Special Warfare Center and School on Fort Bragg, N.C., March 31, 2008. Mullen sat in on a class with special forces soldiers who are being trained in Arabic. Defense Dept. photo by Air Force Tech. Sgt. Adam M. Stump

Chairman of the Joint Chiefs of Staff Navy Adm. Mike Mullen answers a question during an all-hands call at the Ritz-Epps Physical Fitness Center on Fort Bragg, N.C., March 31, 2008. Mullen took questions from the nearly 800 soldiers and airmen in attendance. Defense Dept. photo by Air Force Tech. Sgt. Adam M. Stump