Col. Michael Grismer, 436th Airlift Wing commander, center, listens as Staff Sgt. Jeffry Stamm, 436th Aerospace Medicine Squadron, Readiness Flight NCO in charge, right, describes the functions of a high-volume air sampler used for detecting radioactive particles suspended in the air July 17, 2015, at Dover Air Force Base, Del. Grismer visited to learn about the unit's mission and capabilities. (U.S. Air Force photo/Greg L. Davis)
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