It would be prudent to keep copies of your LES from both before and after your leave period. By then, the Navy will have completed all Y2K upgrades and installations. For those in port, shore facilities have conducted testing to prevent power outages and to assure continuity of pier services like electricity, water and sewage. If you have the mid-watch on New Year's Eve and are responsible for equipment that relies on an electronic calendar, you will want to ensure that your systems have satisfactorily accepted the date change. If problems do occur, report them to your watch officer or LPO and follow casualty procedures as you normally would do.
Technical support is always available in the case of equipment casualties.
The Navy is taking extra precautions to ensure that the sufficient number of properly trained support personnel will be available or on call if system casualties do occur during the year 2000 crossover.