In new feature articles from both Polygon and IGN, Sledgehammer Games has revealed that the campaign will not feature auto-regeneration of health.
IGN reports that if you stay behind cover for a long time in the campaign, health will not auto-regenerate, and you will have to ask a medic in the game.
In addition, there is not way to “pick up” ammo in Call of Duty: WWII campaign. If you run out, you have to ask your squad in campaign to throw you a new magazine to use.
From Polygon, here’s a quote from Glen Schofield on this:
“You have to worry about every bullet,” says Schofield. “You’re not the superhero. You can’t just stand there taking seven bullets, ducking, shooting again. It’s refreshing for us to deal with recruits who aren’t tier-one warriors, to show that vulnerability. They’re naive. It’s been a really cool challenge creating this different kind of gameplay.”
Additional details have also arisen from a GamesRadar article, which suggests that different members of your squad in the campaign have different abilities to help throughout the story. As noted above, one of the can throw you a magazine to give you more ammo, and the medic can provide additional health.
Condrey told GamesRadar that additional squad members have different abilities that can help as well.
“Part of being this squad and working together was about helping each other out in a very different way than in previous games. This is [you] relying on your squad, and so that was a mechanic where you can rely on your squad members to help you, and in that case – when you’re low on ammo – your squad can share ammo. Certain members of your squad have certain attributes that can help you, and if you are in proximity to one of your squad members, and you need their help you can… it’s an active ability.”
It’s also possible to lose squad members during battles, which will affect which abilities you might have available; it will also have an emotional impact on the characters.
“Yeah – there’s possibilities of important members of your squad dying…You can be separated from guys with key abilities that would change how you play – if you’re not with the ammo guy then you have less ability to replenish your ammo. The human loss of your squad is an important emotional impact,” says Condrey, “and there’ll be times that you’re separated and you may lose people that are emotionally important to you, so all of those things can happen, yeah.”