Air Force Tech. Sgt. Eric Smith, 724th Expeditionary Air Base Squadron Civil Engineer Flight heating, ventilation, air conditioning and refrigeration craftsman, troubleshoots a device on a field deployable environmental control unit at Nigerien Air Base 201, Agadez, Niger, Feb. 2, 2021. HVAC/R Airmen are responsible for the mechanical systems that keep Air Base 201’s temperature controlled.

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