A CITIZEN From left to right, Defense Secretary Robert M. Gates, Homeland Security Secretary Janet Napolitano and Alejandro Mayorkas, director of the U.S. Citizenship and Immigrration Service, congratulate one of 31 immigrant U.S. military personnel who took the oath of office in the Pentagon courtyard, Sept. 10, 2009. The new U.S. citizens represented all branches of the service and 20 different countries of origin. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 138718-L-IIQ93-616.jpg Photo Gallery