ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Michael Obringer, 28th Maintenance Squadron aircrew egress systems journeyman, rides an all-terrain vehicle across a hill top at the Buffalo Gap National Grasslands, S.D., July 7. Before riding an ATV, it's important to wear the proper protective equipment. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)