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MIL-P-85723 (AMENDMENT 1), MILITARY SPECIFICATION: PROJECTILE, 20 MILLIMETER, SEMI-ARMOR PIERCING, HIGH EXPLOSIVE INCENDIARY, PGU-28/B (31 JAN 1991) [NO S/S DOCUMENT]., This amendment forms a part of MIL-P-85723(AS), dated 12 August 1986, and is approved for use by the Naval Air Systems Command, Department of the Navy and isavailable for use by all Departments and Agencies of the Department of Defense.