Do you mean the infection game mode?

The Infection Game mode (scr_zom_lastManStanding 0 - or set in Gametype Settings)
===============================================

(similar to BEL from CoD1)

- Allied players (Zombie Killers) must move (by default) or
kill to gain points.
- Axis players (Zombies) must try and kill a certain number of
Allied players so that they too can become Allied.
- When Allied players die, they will become Zombies.

The gametype now has Last Man Standing enabled by default
and uses normal weapon settings. See 'zom_lastman.cfg' or
'Default Cvar List.txt' for more details
https://www.gamefront.com/games/call...etype-for-cod2