MIL-STD-21A, MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (26 NOV 1968) [S/S BY MIL-HDBK-21]., This standard covers the design of joints for structures when one or more of the materials being joined is armor.

MIL-STD-21A (NOTICE 1), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (15 APR 1974) [S/S BY MIL-HDBK-21].

MIL-STD-21A (NOTICE 2), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (15 APR 1974) [S/S BY MIL-HDBK-21].

MIL-STD-21A (NOTICE 3), MILITARY STANDARD: WELDED-JOINT DESIGNS, ARMORED-TANK TYPE (29 NOV 1995) [S/S BY MIL-HDBK-21]., MIL-STD-21 A, dated 9 May 1979, is hereby canceled. Future acquisitions for this item should refer to MIL-HDBK-21, "Welded Joint Designs, Armored Tank Type".