Activision Blizzard said today that its largest downloadable content (DLC) in history for a Call of Duty game is hitting Xbox Live today.

The company is releasing the new content both as two new Spec Ops missions and one new multiplayer map for Call of Duty Elite subscribers. But it is also releasing its full collection of DLC for Call of Duty: Modern Warfare 3 for purchases as a separate collection for those who aren’t subscribers.

In the full “content collection 1” package, Activision is including two Spec Ops missions and four multiplayer maps. That includes the previously released Liberation, Piazza, and Overwatch maps, as well as the new Black Box map.

I’ve played the new Spec Ops missions — Black Ice and Negotiator — and reported on them here. In Black Ice, you team up with another player on a snowmobile and make your way into a diamond mine, where you plant explosives and escape. In Negotiator, you have to free as many captives as you can with your partner and then hold off an enemy counterattack. The new Black Box map is a site where Air Force One has crashed into a Southern California hillside neighborhood.

Those who don’t subscribe to the premium version of Call of Duty Elite can buy the new collection for 1,200 Microsoft Points, or $14.99. Premium Call of Duty Elite players pay $49 a year and get access to all of the new content on a monthly basis. The DLC pack will be available on the PlayStation 3 and PC at a later date.

To celebrate the launch, Activision will pit football stars Ahmad Bradshaw of the New York Giants against Rob Gronkowski of the New England Patriots in a Grudge Match show.