*sigh* That Medic in the second picture with the beard...
![Undecided :-\](https://www.fsegames.eu/forum/Smileys/default/undecided.gif)
Facial hair like that was very rare on GIs. Not saying it didn't happen, but not often. It was against regulations, specifically because it could interfere with the proper sealing of a gasmask. Even in a prolonged combat situation, a "fuller" beard would be more common rather than one shaved in a particular style.
Aside from that, they just weren't the style in the 1940s.
/end rant