just by playing online matches and earning exp. I think you need to get 600exp. to become a general.
It's call a 5 star General and it is the top rank in Halo 3
5 star general
uh...General Grade 4 maybe?
it went from inside halo to inside gaming. because inside halo was running out of news for halo 3 so it went onto gaming in general.
Brigadier General
2xp
alot
x credits
halo 3 obviously
Halo 3: ODST is the newest of the two, but not the newest Halo game.
The halo time line goes Halo Wars, Halo: Reach, Halo:CE (halo 1), Halo 2, Halo: ODST, Halo 3. Halo 3 and ODST are practically at the same time.
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are