Airman 1st Class Tyler Barresi and Senior Airman Phillip Sonderman, 354th Logistics Readiness Squadron, run to slide uphill March 20 at Denali National Park and Preserve, Alaska. The group from Eielson Air Force Base, Alaska, stopped to stretch and view Mount McKinley, the highest mountain peak in North America, at a height of approximately 20,320 feet. (U.S. Air Force photo/Airman 1st Class Laura Max)