Military rank or something similar

[AndreaMarucci]

I'm searching for something to use as military rank on my forum. These ranks are assigned based on the number of messages and I've 10 degrees (100 - 500 - 1000 - 2000 - 4000 - 6000 - 8000 - 10000 - 15000 - 20000] to assign 10 different ranks.

I'll use this mod

http://xenforo.com/community/threads/picture-that-changes-with-post-count.27017/#post-321379

to apply the ranks

I'd like not to use written ranks like newbie, master and so on. I'd like to use something like military ranks since I think they have major impact on my users and are graphically more pleasing.

I'm searching for some suggestion or some graphic pack, if you've any, to evaluate...

thanks in advance...