Senior Airman Jason Ray, a non-destructive inspection technician from the 452nd Maintenance Squadron, March Air Reserve Base, Calif., sets up a KC-135 Stratotanker refueling aircraft brake plate for inspection on a magnetic particle machine. He is checking the brake plate for fatigue and cracks. NDI technicians interpret and evaluate indications of test method applied to detect discontinuities and fl aws in aircraft, aerospace ground equipment, component parts, auxiliary equipment and pressurized and fl uid systems. (U.S. Air Force photo by Val Gempis)