Nothing, didin't buy BO beacose after tersting it I yust noticed it was mostly old game in new package whith some new shit added....
but in MW2 WaW and cod4 it's mostly: Infantry (FALACOG or more exactly FAL whith ACOG)
snajpzorg (sniper... no shit)
eRPeDe (something strong usally carrying a LMG)
shotgunér (shotgun.... ofc)
heavy (something heavy, clumsy, strong, and really great on shooting down shit)
scout (beacose of my past as a TF2 player a made a class whith ranger marathon and lightweight in MW2, also FAL as main)
commando (nothing whith the perk to do, usally a silenced smg and stealthed in many ways like coldblooded or UAV jammer and stuff like that...)
Capitalist basher (AK 47 and something other for making the world more "red")
and so on...