Airman 1st Class Andrew Riesenberger, a 51st Civil Engineer Squadron engineering technician, gathers information during a mapping job Sept. 4, 2014, at Osan Air Base, Republic of Korea. Riesenberger and his coworkers provide maps for the entire base, which have to be updated periodically, such as when a new buildling is erected.(U.S. Air Force photo by Staff Sgt. Jake Barreiro/Released)