Senior Airmen David Fisher, 28th Maintenance Squadron avionics technician, removes connectors from a central integrated test system data acquisition unit motherboard to replace guide pin sleeves in the digital analog video avionics shop on Ellsworth Air Force Base, S.D., May 9, 2012. The guide pin sleeves secure the unit in the B-1 bomber and also act as a ground for electric currents. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)