Included in the WW2 bunch is Humphrey Bogart. The classic trademark mouth thing was from a wound received when a zero crashed into the ship he was on. (If memory serves me)
Bogart was far too old to have served in WWII, but if memory serves he was in the US Navy during WWI. How he got the lisp is a subject of much conjecture and many versions of truth. I don’t think Bogey was too forthcoming about the details.