https://www.polygon.com/2017/11/2/16593800/call-of-duty-wwii-difficulty

Call of Duty: WWII is a hard game. There is no regenerating health, which means you have to rely on med packs you find around the environment or ask the medic in your squad to throw you one. You have to make sure you manage your health through the chaotic firefights, but also your inventory. Do you have enough med packs? Do you need to find more? Should I use one now, before the battle, in case things go sideways?

I died often before I was able to adjust to the new system, and to the game’s more aggressive feel — with the enemies and the number of times you die while moving toward your objective. But that’s all part of the plan.