U.S. Air Force Senior Airman Kostiantyn Khymchenko, 633d Civil Engineer Squadron heating, ventilation, air conditioning journeyman, climbs the ladder of a cooling tower to test the air temperature at Joint Base Langley-Eustis, Virginia, July 25, 2023. As an HVAC journeyman, Khymchenko inspects and performs maintenance on cooling towers, ensuring their upkeep in order to continually provided neutral air temperature for facilities across the base. (U.S. Air Force photo by Airman 1st Class Mikaela Smith)