Master Sgt. Scott Archer and Staff Sgt. Dane Sauer, 90th Medical Operations Squadron, perform a sentry post change as Master. Sgt. Jeanette Olive, 90th MDOS, looks on during a POW/MIA vigil at the Wyoming State Capitol Building Sept. 19. For 24 hours, two Airmen at a time marched as sentries as another Airman read names of past service members who are presumed to still be prisoners of war, and are still missing in action. (Photo by Tech. Sgt. Kurt Arkenberg)