Senior Airman Nicholas Arvelo, a bioenvironmental engineering technician with the 5th Medical Group, performs a seal check for a protective mask at Minot Air Force Base, , Sept. 22, 2016. A seal check is performed to ensure that no air leaks inside the mask during a breathing test. ( Air Force photo/Airman 1st Class Jonathan McElderry)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 5mdos, bio, bioenvironmental, engineering, technicians