WASHINGTON -- Airman 1st Class Carlo Santiago stands with service members during the Presentation of Candidates during a U.S. Military Naturalization Ceremony, Sept. 10, 2009, at the Pentagon. During the ceremony Secretary of Defense Robert Gates thanked the 31 service members for their service and Secretary of Homeland Security Janet Napolitano led them with the oath of allegiance. (U.S. Air Force Photo/Master Sgt. Stan Parker)