Air Force Staff Sgt. Derek Roybal, Staff Sgt. Nicholas Hodgkin, and Staff Sgt. Benjamin Hogan, Heating Ventilation Air Conditioning journeymen, 729th Air Control Squadron, Hill Air Force Base, Utah, perform an operations check on field deployable environmental control units, Sept. 7, 2022, Hill AFB. The 729th Air Control Squadron supports in-theater commanders by providing rapid deployment of mobile air control systems.

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Photo credit: © Operation 2022 / Alamy / Afripics
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Keywords: air, conditioning, hill, hvac, test