Tech Sgt. Robert Holyoke, 28th Munitions Squadron support equipment technician, performs a 365 day inspection on an aluminum rail set trailer at Ellsworth Air Force Base, S.D., Feb. 7, 2013. Each aluminum rail set trailer must be inspected annually to ensure it is serviceable. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)