People holding placards stand in the middle of a crosswalk during a flash mob event in memory of the late South Korean Sergeant Yoon Jang-ho, and to protest the sending of troops overseas for the U.S., in central Seoul March 2, 2007. Yoon was among those killed in a suicide bomb attack outside the U.S. military base in Afghanistan where U.S. vice President Dick Cheney was visiting on February 27, 2007. The placards read, 'Stop sending troops overseas'.