Check the chamber
A staff sergeant checks Senior Airman Marcos Diaz’s, of the 96th Force Support Squadron, weapon before allowing him to enter the tent after a patrol during the Phase II exercise Aug. 10 at Eglin Air Force Base, Fla. More than 100 Airmen braved black flag conditions (and rain) in chemical gear and gas masks to execute self-aid and buddy care, security and chemical attack avoidance missions. The Phase II was part of a large week-long Operational Readiness Exercise on base. (U.S. Air Force photo/Samuel King Jr.)