Officer Sean Doyle, the senior K-9 handler assigned to the Rapid City Police Department, and Stryker, a K-9 assigned to the RCPD, find simulated drugs under mailboxes at the Rushmore Mall in Rapid City, S.D., Sept. 24, 2017. The Rushmore Mall is the first of many locations for joint-training between Ellsworth Air Force Base and the RCPD. Future locations are scheduled to include local courthouses, airports, and other high-traffic, at-risk environments. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)