Weapon Loaders, 148th Fighter Wing, Duluth, Minn. load weapons on Block 50, F-16's for Combat Hammer, May 5, 2015 while at Hill AFB, Utah. Combat Hammer is a Weapons System Evaluation Program (WSEP) that evaluates the entire weapon process, from build-up to employment. (U.S. Air National Guard photo by Master Sgt. Ralph Kapustka)