Airman 1st Class Hunter Harveston, 28th Security Forces Squadron response force member, checks an ID card at the Liberty Gate at Ellsworth Air Force Base, S.D., Feb. 12, 2015. 28th SFS defenders use the Defense Biometric Identification System to determine if an individual is authorized entry to the base. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)