Halo 4 Spartan Ops Episode 3 now available

“Catherine” can be found by starting up Halo 4 and then heading to Infinity  >  Spartan Ops > Play Chapters > Episode 3.

This is included for all versions of Halo 4 at no extra charge

Plus, the War Games playlists have been updates with Team Snipers and Team Slayer Pro.