Air Force Airman 1st Class Austin Milliren, an aircraft fuel systems repair technician with the 379th Expeditionary Maintenance Squadron, signals that he is ready to start his role playing as a trapped technician during a confined space training exercise, April 14, 2017. Given the possible dangers associated with working in a fuel cell, these Airmen counteract the risk by training in realistic scenarios.

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Photo credit: © PR Collection / Alamy / Afripics
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