When first developed Military Standard 188 (MIL-STD-188) covered technical standards for tactical and long-haul communications, but as it was revised (MIL-STD-188A, MIL-STD-188B) it became a document applicable to tactical communications only (MIL-STD-188C 24 Nov 1969[3]).[4] The Defense Information Systems Agency published circulars which announced both standards and engineering criteria relating to the long-haul Defense Communications System and to the technical support of the Worldwide Military Command and Control System.[4] In line with a decision by the Joint Chiefs of Staff, these standards are published in the MIL-STD-188 series of documents. This series is subdivided into "a MIL-STD-188-100 series covering common standards for tactical and long-haul communications, a MIL-STD-188-200 series covering standards for tactical communications only, and a MIL-STD-188-300 series covering standards for long-haul communications only."[4]