How Do I Take Campaign Screenshots?

None of the Halo 4 campaign sessions, solo or with a friend, seem to be available in theater afterward. Maybe I’m wrong but I thought these sessions were available in Halo Reach along with the multiplayer games played. I haven’t tried multiplayer in Halo 4 yet so I don’t know if that is showing up in theater or not, but I wanted to take some screenshots from campaign and can’t figure out how to do it.

campaign and spartan ops theater doesn’t exist in halo 4.

Theater is only available for the war games modes. From past info it seems that campaign theater could be available at a later date.

Thanks. That answers that.