Staff Sgt. Patrick Koss of the 133rd Aircraft Maintenance Squadron checks the chocks he just placed under the wheel of Air Force One on the ramp of the 133rd Airlift Wing at the Minneapolis-St. Paul International Airport on August 30, 2011. The VC-25A, which is a highly customized Boeing 747-200B, arrived at the Minnesota Air National Guard base bringing President Barack Obama, the commander-in-chief, to the Twin Cities where he delivered a speech to the American Legion Annual Conference. The visit is heavily supported with security, logistics, media and other support by the Airmen of the 133rd Airlift Wing. USAF official photo by Senior Master Sgt. Mark Moss