Airman 1st Class Joshua Tabasa, a heavy equipment operator assigned to the 28th Civil Engineer Squadron, tests the air within a confined space to ensure the air is breathable on Ellsworth Air Force Base, S.D., May 18, 2021. Ensuring the air levels are safe allows workers to complete their job safely. (U.S. Air Force photo by Airman 1st Class Jonah Fronk)
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