Staff Sgt. Johny Hargrove, 436th Civil Engineer Squadron explosive ordnance disposal flight craftsman, places a mock unknown substance in a vial Sept. 17, 2018, on Dover Air Force Base, Del. Donned in protective gear, Hargrove used a test kit to identify the mock hazardous substance that came from a package inside the base centralized mail handling facility’s mailroom. This scenario was part of a two-day Force Protection/Major Accident Response Exercise. (U.S. Air Force photo by Roland Balik)
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