MIL-STD-1839B, DEPARTMENT OF DEFENSE STANDARD PRACTICE: CALIBRATION AND MEASUREMENT REQUIREMENTS (20 AUG 1995)., This standard describes the requirement to provide a means for calibration and measurement traceability of all system, subsystem, and equipment parameters to ensure system and equipment operational integrity and accuracy. It defines the requirement for establishing measurement traceability from actual system and equipment level measurements to the National Institute of Standards and Technology (NIST) or other approved measurement sources. These measurements are traced through properly selected and calibrated Test, Measurement, and Diagnostic Equipment (TMDE) or appropriate measurement sensors, through individual Military Department or commercial calibration facilities, to approved national measurement standards.