Airman 1st Class Joseph Phillips, 99th Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration apprentice, checks the temperature and pressure of a cooling unit at the 99th Logistics Readiness Squadron vehicle maintenance building Aug. 13, 2013, at Nellis Air Force Base, Nev. The HVAC/R unit conducts quarterly inspections on cooling systems to ensure maximum capability across the installation. (U.S. Air Force photo/Senior Airman Brett Clashman)
Airman 1st Class Joseph Phillips, 99th Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration apprentice, adds oil lube to the motor of an air-handler unit at the 99th Logistics Readiness Squadron vehicle maintenance building Aug. 13, 2013, at Nellis Air Force Base, Nev. The oil provides lubrication to the motor to function properly. (U.S. Air Force photo/Senior Airman Brett Clashman)
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