U.S. Air Force Airman 1st Class Colton Ash, 633d Civil Engineer Squadron water and fuel systems maintenance apprentice, removes a screw from a valve on a vacuum at Joint Base Langley-Eustis, Virginia, Aug. 9, 2024. Vacuum stems are complex and require specialized maintenance compared to traditional gravity-based plumbing. (U.S. Air Force photo by Airman 1st Class Skylar Ellis)