As forum members post to the forum, their forum rank increases. Below are the ranks for the number of posts:
# posts - rank
0 - Cadet Trooper
3 - Storm Trooper
7 - Officer
10 - Lieutenant
15 - Squadron Leader
25 - Commander
50 - Captain
100 - Commodore
250 - Major General
500 - Admiral
1000 - Grand Admiral
May the force be with you.