Precision matters
U.S. Air Force Senior Airman Charles Bennett tightens a high pressure fitting on a heiseboard in the precision measurement equipment laboratory on Seymour Johnson Air Force Base, N.C., March 28, 2012. Maintainers use the heiseboard to calibrate a variety of gauges found on fuel trucks, fire trucks and fire suppression systems. Bennett, 4th Component Maintenance Squadron precision calibration technician, hails from Franklin, N.C. (U.S. Air Force photo/Airman 1st Class John Nieves Camacho/Released)