Pittsburgh, PA - September 24, 2009 -- A serviceman walks with a flag before the welcoming dinner for G-20 leaders at the Phipps Conservatory on Thursday, September 24, 2009 in Pittsburgh, Pennsylvania. Heads of state from the world's leading economic powers arrived today for the two-day G-20 summit, held at David L. Lawrence Convention Center, aimed at promoting economic growth. .Credit: Win McNamee / Pool via CNP