U.S. Air Force Senior Airman Diego CalleCalle, a 1st Special Operations Civil Engineer Squadron Mission Sustainment Team member, helps put together a military shelter system during a MST training March 3, 2022, at Hurlburt Field, Florida. Members of the MST are trained in advanced expeditionary skills and are able to accomplish tasks outside of their U.S. Air Force speciality, such as providing shelter in austere locations. (U.S. Air Force photo by Senior Airman Miranda Mahoney)
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