Re: 159th Infantry Regiment
For 159th Infantry Stanton's OB says, "arrived in France 18 Mar 45 where attached to the 106th Infantry Division throughout European service and entered Germany on 25 Apr 45; returned to New York P/E (Port of Embarkation) 4 Nov 45 and inactivated at Camp Shanks NY on the same date."
His narrative for 106th Div says, "The division was reconstituted 16 Mar 45 when the 3rd Inf and 159th Inf were attached to replace its surrendered regiments. It then moved back into Germany 25 Apr 45, but was relegated to duty processing prisoners and performing military occupation of secure areas." He shows div location Aug 45 as Bad Ems Germany.
Since the regiment was a California Nat'l Guard outfit, the Calif Center for Military History might be able to help you further. Info about them can be found at this URL:
As another possibility, I found this vet assn contact listed online:
159th Infantry, Company F
Mr. Irvin J. Schmidt
355 Chateau Drive
La Porte, IN 46350-1922