Fun for all!
It was amazing to see how they lived back in the day. The ship was well maintained and could visit 4 levels of it!!! My favorite was the hammocks. The stairs you climb down are very steep (backwards is best).
All military members are free, spouses are not, but I suggest getting the ticket to get on all four ships/sub (only $18, $15 for seniors, free for children 5 and under). The submarine was the coolest!!! They had it rough...