U.S. Air Force Staff Sgt. Michael Gadlin (left), 15th Judge Advocate office paralegal, and Senior Airman Joseph Smith, 15th Comptroller Squadron financial services technician, fill sandbags during a chemical, biological, radiation, nuclear and explosive exercise at Base X on Joint Base Pearl Harbor-Hickam, Hawaii, Feb. 6, 2015. The exercise tested the group’s ability to survive and operate in a hostile or chemical environment. (U.S. Air Force photo by Tech. Sgt. Terri Paden/Released)