A custom U.S. Air Force helmet rests on a motorcycle during the 2013 Dakota Thunder Run on the flightline at Ellsworth Air Force Base, S.D., Aug. 6, 2013.The run is intended to honor military members and veterans, and culminates with a military appreciation event each year where a local veteran is recognized for their service. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)