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.
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.
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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