Staff Sgt. Tavis Scheller and Senior Airman Micah Rodriguez ensure packages filled with ammonium nitrate are not damaged Dec. 11, 2014, at Little Rock Air Force Base, Ark. The ammonium nitrate is used along with other explosives to train military working dogs in detecting chemical hazards. Scheller is a 19th Maintenance Squadron munitions flight senior inspector and Rodriguez is a 19th MXS munitions flight stockpile surveillance crewmember. (U.S. Air Force photo by Airman 1st Class Harry Brexel/Released)
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