Master Sgt. Petra Nelson, 62nd Medical Squadron dental section chief, administers the flu vaccine to Team McChord Airmen Oct. 28, 2016, during a point of dispensing exercise at Joint Base Lewis-McChord, Wash. The exercise aimed to test McChord Field’s ability to vaccinate the base populace in the event of a harmful disease outbreak. (U.S. Air Force photo\ Tech. Sgt. Tim Chacon)
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