Airmen from Joint Base Elmendorf-Richardson Air Force Base, Alaska, enter an all-terrain vehicle riding course during a training session at the Hillberg Ski Resort June 10, 2015. Malmstrom Air force Base, Mont., recently passed regulations allowing the use of ATVs and motorcycle side-passenger attachments (side cars) on base. (U.S. Air Force photo/Airman Christopher R. Morales)