Sgt. Colin W. Gabriel, left, and Sgt. Zach M. Walker, right, air traffic controllers on the air station here, program the frequencies on a remote improvised explosive device during a field training exercise at Range 131 here Oct. 26. - Sgt. Colin W. Gabriel, left, and Sgt. Zach M. Walker, right, air traffic controllers on the air station here, program the frequencies on a remote improvised explosive device during a field training exercise at Range 131 here Oct. 26.