Airmen read instructions while conducting a post-attack reconnaissance sweep Jan. 28, 2011, at Osan Air Base, South Korea, as part of Beverly Bulldog 11-01, an operational readiness exercise. Post-attack reconnaissance sweeps are conducted after an attack to survey the area for contamination, unidentified explosive ordnance, casualties or suspicious activity. (U.S. Air Force photo/Senior Airman Evelyn Chavez) Photo essay: Osan Airmen take part in operational readiness exercise by Senior Airman Evelyn Chavez 51st Fighter Wing Public Affairs 2/1/2011 - OSAN AIR BASE, South Korea (AFNS)  -- Airmen participate in Beverly Bulldog 11-01, an operational readiness exercise here Jan. 28. The exercise allows Airmen to demonstrate their ability to complete the mission in simulated chemical environments while executing their primary duties, practicing self-aid and buddy care, and conducting post-attack reconnaissance and unexploded ordnance sweeps. View the slideshow.