F-16's from the 178th Fighter Wing, Springfield Air National Guard Base fly a 'Missing Man' formation over the C-141 Final Flight and Turnover Ceremony at the National Museum of the United States Air Force. The first aircraft, a C-141 Starlifter, to return Vietnam prisoners of war to the United States makes its final landing Saturday May 6, 2006 at the National Museum of the United States Air Force. The C-141 'Hanoi Taxi' was the first aircraft to arrive in Hanoi in February 1973 to pick up the POWs held by the North Vietnamese.(U.S. Air Force photo by TSgt Rick Sforza, 4th Combat Camera)