Help finding info on my wife's Grandpa's military service info

Homerboy

Lifer
Mar 1, 2000
30,890
5,001
126
So Memorial Day got us thinking/talking at home. My wife's Grandpa was in the service during WWII and my son (17) has really found an interest in the war and it's history, so we figured it would be good to dig up what we could on what is his Great-Grandpa. I figured as well that ATOT could probably do a better job than I could at it, so here's his info:

Name: Clarence Viestenz
DOB: 11/26/1918
Service: WW2 veteran. 358th Infantry, Company K
Received Purple heart and 2 oak clusters

Any info anyone can dig up would be greatly appreciated.
Thanks in advance.