Air Force Col. Clair Gilk, 316th Operations Group commander, greets Canadian Prime Minister Stephen Harper at Andrews Air Force Base, Md., Nov. 14, 2008. The Canadian prime minister was attending the two-day G20 Summit at the White House in Washington. The summit, hosted by U.S. President George W. Bush, brought together world leaders to discuss the increasing global financial crisis, its causes and efforts to resolve it. (U.S. Air Force photo by Tech. Sgt. Craig Clapper)