Trying to find my grandfathers company within the Army 112th infantry Regiment WW2

I am trying to find any records that may help locate which company my grandfather was in while serving in WW2 in the 112th Infantry Regiment.  His name was Sigurd Erickson (39 195 765) and he was a Heavy Machine Gunner; and I know he was in Ardennes. I have attached his discharge papers to help with any questions that may arise.  We tried to request his papers but they were lost in the fire that occurred in the 70's.  /resized-image/__size/640x480/__key/communityserver-discussions-components-files/65/0027.image.png