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IRIG Standard 200-98 was last updated in May 1998 and defined the characteristics of the serial time codes A, B, D, E, G, and H This 2004 edition of the Standard incorporates year information for codes A, B, E, and G. Codes D and H remain unchanged. The task of revising this standard was assigned to the Telecommunications and Timing Group (TTG) of the Range Commanders Council (RCC). All U.S. Government ranges and facilities should adhere to this standard where serial time codes are generated for correlation of data with time. iii