Senior Airman Jimmy Padilla, left, and Staff Sgt. Stephan Bradley, 607th Air Control Squadron Heating, Ventilation and Air Conditioning technicians, test an air conditioning unit’s wiring.The 607th is a tennant unit of Luke, and conducts initial qualification training for operations crew personnel assigned to ACSs. (U.S. Air Force photo/Airman 1st Class David Bulkley)