Airman Brandon Hickman, 28th Security Forces Squadron response force member, verifies ID cards at the gates of Ellsworth Air Force Base, S.D., Feb. 10, 2016. Airmen of the 28th SFS 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 Denise M. Nevins/Released)