Colonel Steven M. Shepro, 316th Wing commander, greets Mexican President Felipe Calderon at Andrews Air Force Base, Md., Nov. 14, 2008, for the two-day G20 Summit at the White House in Washington. The summit, hosted by U.S. President George W. Bush, will bring together world leaders to discuss the increasing global financial crisis, its causes and efforts to resolve it. (U.S. Air Force photo by Senior Airman Giang Nguyen)