U.S. Airmen from the 437th Aerial Port Squadron use a K-Loader to move a Negatively Pressurized Conex prototype after it was delivered to Joint Base Charleston, S.C., April 21, 2020. The NPC will be tested for potential use as a transport module for individuals infected with the COVID-19 virus and other highly infectious diseases. (U.S. Air Force photo by Staff Sgt. Chris Drzazgowski)
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