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Airmen from the New Jersey Air National Guard's 108th Civil Engineer Squadron and 141st Air Refueling Squadron wear protective masks during a chemical, biological, radiological and nuclear readiness training excercise while aboard a KC-135R Stratotanker over the continental U.S., Feb. 8, 2019. (U.S. Air National Guard photo by Airman 1st Class Andrea A. S. Williamson)
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