ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Timothy Hoffpauir, 28th Civil Engineer Squadron explosive ordnance disposal technician, performs an operational check of a Remotec ANDROS F6A bomb disposal robot. The F6A is equipped with articulating tracks for navigating ditches, obstacles, stairs and uneven terrain. (U.S. Air Force photo/Staff Sgt. Marc I. Lane)