Matchmaking
You must get to the rank Luitenant in a game type or for your rank.
rank up to brigadier and buy it for 300,000 credits.
you have to rank up to seargent
Get your overall rank to Lieutenant
5 star general
I believe Lieutenant.
it means to get a higer rank it doesnt make you better at halo 3 but what i said before it some times makes you a higher rank :)
It's call a 5 star General and it is the top rank in Halo 3
After the rank captain and captain grades 1, 2 and 3 is Major
You cannot loose rank. Once you obtain a rank up you cannot go back down.
A level 50!