39th Infantry was an organic element of 9th Infantry Division. Company E was an element of the regiment's Second Battalion (one of the battalion's three rifle companies).
A website, < http://www.oldreliable.org/rollcall/rcset.htmlhttp://www.oldreliable.org/rollcall/rcset.html >, lists e-mail addresses of a number of men who served with the regiment during World War II. The list includes Ray White and Frank A. Wood, both of whom were members of Company E (although they may not have served with the same platoon as your subject).
You may also want to order his deceased file. You'll find instructions at Message #2112 (go back to the Main Page, enter "2112" in the box in the upper right corner marked "Jump to #_____" then click on "Go").