John Semands, an electronics engineer with the 76th Software Engineering Group, explains the functionality of fiber optic transmitters within the data acquisition system to visitors from the Senior EMP Working Group during a tour of the Compass Rose Testing Facility Jan. 22. The facility was running hardness maintenance/hardness surveillance electromagnetic pulse testing on a B-52H Stratofortress from the 2nd Bomb Wing, Barksdale Air Force Base, Louisiana. (U.S. Air Force photo/Kelly White)