Senior Airman Adam Hefty, 28th Maintenance Squadron avionics test station journeyman, tightens loose wires in a Band 6 Source unit on Ellsworth Air Force Base, S.D., Dec. 28, 2011. The Band 6 Source units, used on B-1B Lancers, generate defensive electronic warfare signals. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/released)