PRESIDENTIAL CHAT U.S. President Barack Obama and U.S. Army Gen. David H. Petraeus, commander of International Security Assistance Forces and NATO Troops in Afghanistan, chat between meetings during the NATO Summit in Lisbon, Portugal, Nov. 20, 2010. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 200126-T-SGT51-823.jpg Photo Gallery