Tech. Sgt. Thomas Kasten, 811th Security Forces Squadron patrolman, looks for any possible threats while President Obama waves to the crowd before departing Joint Base Andrews, Md., March 29, 2013. 811th SF airman provide security on the flightline for the presidential movements. (U.S. Air Force photo /Staff Sgt. Perry Aston)
Staff Sgt. Perry Aston
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