An airman struggles to get his hood sealed quickly during a simulated mission oriented protective posture level 4 attack at the Phase II exercise Aug. 10 at Eglin Air Force Base, Fla. More than 100 airmen braved black flag conditions 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.