User blog comment:WonderfulUnicorn/New admiral prediction (home-made character)/@comment-3425840-20130211005132/@comment-4605926-20130211134922

Actually it is stated on the "Marine Ranks" page in the "Admiral" section that only three marines can hold this title at a time.

P.S. I'm doing a few adjustments to my admiral, so don't add it just yet in case you were planning to.