U.S. Air Force Airman 1st Class Jacob Boer, 1st Maintenance Squadron non-destructive inspection journeyman, tests oil at Joint Base Langley-Eustis, Virginia, Feb. 15, 2019. Non-destructive inspection Airmen use the SpectrOil M machine to analyze fine particles in lubricants, hydraulic fluids and coolants. (U.S. Air Force photo by Airman 1st Class Monica Roybal)