MIL-S-46172A (NOTICE 1), MILITARY SPECIFICATION: STEEL FORGINGS (19 MAR 1998)., This notice should be filed in front of MIL-S-46172A(AR) MIL-S-46172A(AR) dated 9 November 1984 with Amendment 2, dated 17 July 1987 is inactive for new design and no longer used except for replacement purposes.