Senior Airmen Steven Rosales (left) and David Fisher, 28th Maintenance Squadron avionics technicians, unscrew a circuit board from a central integrated test system data acquisition unit motherboard to replace guide pin sleeves at the digital analog video avionics shop on Ellsworth Air Force Base, S.D., May 9, 2012. The unit samples, processes and distributes subsystem test data to allow the computer and navigation systems of the B-1 bomber to work properly. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)