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MIL-STD-2189/100-1, MILITARY STANDARD: DESIGN METHODS FOR NAVAL SHIPBOARD SYSTEMS (SECTION 100-1) REINFORCEMENT OF OPENINGS IN STRUCTURE OF SURFACE SHIPS OTHER THAN IN PROTECTIVE PLATING (22 JAN 1988) [SEE NAVSEA DDS-100-1]., This standard has been prepared to set forth design methods around openings in structural members of naval ships. Such openings are made for the following purposes: (a) lighten members. (b) For access or inspection. (c) To allow passage of wiring, piping, and ventilation ducts.