Spartan Ops Double XP Promotion this Weekend
From the Halo Waypoint Blog:
…by playing Spartan Ops the weekend of May 3-5. When you play and complete 10 Chapters of Spartan Ops, we will give you 10 Double XP Matches!
Once you receive your 10 matches on May 24th, you will be able to see your Double Experience Points stats appear during the post-game summary in the very next 10 Halo 4 Infinity Multiplayer games you play, whether it be Spartan Ops Chapters or War Games Matches, or any combination of the two.