Well, uhm, WWI veterans couldnt fight on WWII. If they were at least 20 years old to the end of war (1918) + 24 years. 44 years in 1942, that impossible mate, too old for that. And most of veterans of WWI just abandon army in first years, the ones that stayed were dimobilized by the military cuts. Only rare officers, the US amry was too young that time.