If you're looking to level up in Black Ops 6, your XP tokens from Modern Warfare 3 were briefly available, but have since vanished.

Black Ops 6 features a diverse map list across both core modes and Strike, and these are all of the maps available in the latest Call of Duty that ... the original Modern Warfare 2 (2009), BO6 ...

At ease soldiers. It’s time for one hell of a debriefing. This is the story of Call of Duty: Black Ops.