PENTAGON HALL President Barack Obama waves goodbye after greeting troops during his first visit to the Pentagon, Jan. 28, 2009. Obama and Vice President Joe Biden met with U.S. Defense Secretary Robert M. Gates and all the service chiefs to get their input on the way ahead in Afghanistan and Iraq. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 351455-G-QXV78-499.jpg Photo Gallery