(Left) Airman 1st Class Shane Gorman and Charles Mills, 28th Maintenance Squadron nondestructive inspection technicians, apply penetrant liquid to a hydraulic accumulator at Ellsworth Air Force Base, S.D., Aug. 9, 2013. Penetrant testing is a cost effective method of detecting surface cracks, corrosion, scratches and other surface impurities that otherwise would hinder the mission readiness of the B-1. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)