The Free Access period begins July 20 at 10 AM PT and lasts through July 26 at 8 AM PT. Here's the official word on the free access week: What's more, July 26 will see the 'Mercenaries of Fortune' update arrive (though without a new Zombies map). Players who haven't jumped in yet now have a great chance to do so, as both the cooperative Zombies and competitive Multiplayer modes are free to download and play from July 20-26.
Call of Duty: Vanguard 's campaign mode might not have set the world on fire, but the multiplayer modes are still going strong.