User blog comment:Deathmanstratos/Call of Duty: Black Ops II Origins Intro Cinematic released/@comment-356904-20130820161536/@comment-3171236-20130820195449

Stalhelms were actually introduced in 1916 to replace the imperial helmets used. There are some World War 1 photos that show German troops with stalhelms.

StG-44s in World War 1 don't make sense even if it is a dieselpunk universe, but I'm not going to complain.