MIL-STD-2042/3A, DEPARTMENT OF DEFENSE STANDARD PRACTICE: FIBER OPTIC CABLE TOPOLOGY INSTALLATION, STANDARD METHODS FOR NAVAL SHIPS (CABLE PENETRATIONS) (PART 3 OF 7 PARTS) (29 SEP 1997)., This standard practice provides detailed methods of optical fiber cable penetrations through ship structure and equipment via stuffing tubes, swage tubes, multiple cable penetrators, chafing collars and nipples.