Page 13 is essentially the equivalent of being reprimanded and written up in the civilian world. It is non judicial punishment and goes into your official record. If I recall put in page 13 of your record. You can receive punishment of reduction in rank, 30 days confined to barracks and stripped of 50 percent of you pay.
So it’s the same thing as an Article 15 in the UCMJ (my experience is USAF) just applicable to the Navy?