Actually it is Cod. Old Cod. Cod 3, not mw3. You had to work as a team. You had a medic to revive downed teammates and a support gunner to lay down the pain. I can't wait. Cod3 was awesome.
Sadly, it seems lately asking CoD players to work as a team is like Herding Cats.
Let's clarify this.
In the Campaign, there is no traditional Health Regen. If you get hit, you are injured. You need to seek out the medic in your Squad who will heal you.
No word on MP, but I am sure Core will have the magic health fairy return.