Standard oil sits in a catch tray in the 380th Expeditionary Maintenance Squadron Non-Destructive Inspection shop at Al Dhafra Air Base, United Arab Emirates, Dec. 7, 2018. The NDI shop uses certain techniques, including fluorescent penetrant inspections and special oil analyses. These are some of the numerous methods used to repair, diagnose or prevent damage to the aircraft, its oil, and the parts. (U.S. Air Force photo by Senior Airman Mya M. Crosby)