Steve Starliper, 89th Maintenance Group non-destructive inspection technician, inspects an aircraft part using a liquid inspection technique Jan. 24 here. Liquid inspection is widely used technique among military bases and is a low-cost method. This method is used to locate surface-breaking defects in all non-porous materials including metals, plastics, or ceramics. (U.S. Air Force Photo/Senior Airman Perry Aston)