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SPANGDAHLEM AIR BASE, GERMANY -- Airman 1st Class Daniel Farrell, 52nd Civil Engineer Squadron readiness and emergency management flight, assists Staff Sgt. Chris Parrish, 52nd Maintenance Operations Squadron, with a proper seal during Tuesday’s Chemical, Biological, Radiological, Nuclear and High-Yield Explosive defense training here. (US Air Force photo/by Staff Sgt. Andrea Knudson)