Department of Defense master clock
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The Department of Defense master clock is the master clock to which time and frequency measurements for the United States Department of Defense are referenced, that is to say, are traceable.
The U.S. Naval Observatory master clock is designated as the DOD Master Clock. 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.