Thanks for the replies everyone! That's good to know.
@JimRat - yeah, I was pretty sure we topped off pretty often, but I don't think we did it every 3 days. However, I worked a 12 hour rotation when out to sea, so it's very possible we could have UNREP'ed while I was in the bunk and didn't even realize it!
If I remember correctly, our boat help about 208,000 gallons of fuel not including JP5, so I am sure we took on fuel more often then a remember. It's been too long though, so I am just not sure.
Cool story though - we had a chance to UNREP from the Battleship Missouri once before she was decommissioned. Not sure why we did this, because we didn't even take on enough fuel to make it worthwhile. Sure was neat to see her that close while underway though!
Dave