Navy accommodations on ships are likely to be more cramped due to space limitations, particularly on submarines.
Current Nimitz class carriers have a crew of 3,000-3,200, not including air wing. Some carriers of older classes were in service in the 1990s; they were of similar size with similar crew sizes. The new Gerald R. Ford class carriers will be of similar size with 700 fewer crew.
http://www.navy.mil/navydata/fact_display.asp?cid=4200&tid=200&ct=4