Airman 1st Class Andre P. Paqtalunan, 509th Expeditionary Aircraft Maintenance Unit B-2 propulsion system journeyman, Airman 1st Class William F. Wolf, 509th EAMXU B-2 propulsion system apprentice, and Staff Sgt. Aqeel S. Mitchell, 509th EAMXU propulsion system analyst, troubleshoot continuity at an air turbine starter control valve May 20. (U.S. Air Force photo by Senior Airman Christopher Bush)