Airman 1st Class Michael Rusnak, 28th Civil Engineer Squadron survey chief, leads a team of survey technicians to collect information during base mapping at Ellsworth Air Force Base, S.D., March. 6, 2012. Survey technicians are responsible for collecting data in the field, making calculations and helping with computer-aided drafting of base maps. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)