MIL-W-22176A (AMENDMENT 4), MILITARY SPECIFICATION: WATCH, WRIST, SUBMERSIBLE (400-FOOT), NON-MAGNETIC (22 JUL 1987) [NO S/S DOCUMENT]., This amendment forms a part of MIL-W-22176A(SHIPS), dated 24 March 1961, and is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense.