Airman 1st Class Jacob Mason, 28th Civil Engineer Squadron survey technician, collects geographic coordinate data at the Bandit Lanes bowling alley parking lot with a global positioning system device and a survey rod during base mapping at Ellsworth Air Force Base, S.D., March. 6, 2012. Survey technicians use GPS devices to obtain precise coordinates to create the most accurate, up-to-date map information. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)