MIL-STD-2179B (NOTICE 1), MILITARY STANDARD: HELICAL DIGITAL RECORDING FORMAT FOR 19-MM MAGNETIC TAPE CASSETTE RECORDER/REPRODUCERS (30 OCT 1998) [NO S/S DOCUMENT]., This notice should be filed in front of MIL-STD-2179B, dated 14 December 1990.MIL-STD-2179B is inactive for new design and is no longer used except for replacementpurposes.