Mink, a Military Working Dog assigned to the 28th Security Forces Squadron, stands on top of an obstacle at Ellsworth Air Force Base, S.D., Oct. 31, 2017. The Veterinary Treatment Facility on base cares for MWDs such as Mink so they can remain able to carry out their part of the Air Force mission. (U.S. Air Force Photo by Airman 1st Class Thomas Karol)