A mock explosive rests in a tire rim during a weeklong explosive detection certification course at Fort Eustis, Va., Aug. 31, 2015.  Canines and handlers participated in several detection courses throughout the week to gain certification for military operations. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)
<br>Unit: 633rd Air Base Wing
Staff Sgt. Natasha Stannard
Taken on 31 August 2015
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