ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Michael Obringer, 28th Maintenance Squadron aircrew egress systems journeyman, rides an all-terrain vehicle down a hill at the Buffalo Gap National Grasslands, S.D., July 7. Airman Obringer goes slowly down the hill making sure not to flip the ATV. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)