OSAN AIR BASE, South Korea -- Tech. Sgt. Walter Swan, a weapons safety manager and exercise evaluation team member, ignites a smoke grenade to indicate a simulated attack during a peninsula-wide exercise at Osan Air Base. The operational readiness exercise tests Team Osan's ability to execute combat operations, receive follow-on forces and defend the base from attack. (U.S. Air Force photo by Senior Master Sergeant Marvin Krause)
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