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The master clock to which time and frequency measurements for the U.S. Department of Defense are referenced, i.e. , are traceable. Note 1: The U.S. Naval Observatory master clock is designated as the DOD Master Clock. (188) Note 2: The U.S. Naval Observatory master clock is one of the two standard time and frequency references for the U.S. Government in accordance with Federal Standard 1002-A. The other standard time and frequency reference for the U.S. Government is the National Institute of Standards and Technology (NIST) master clock.