These histories of WWII military units are available full-text on the Hathi Trust website:
Second to None: the History of the 305th Infantry in WWII History of the 313th Infantry in WWII
History of the 12th Infantry Regiment in WWII
History of the 3rd Infantry Division in WWII
Battle Babies: the Story of the 99th Infantry Division in WWII
Ours to Hold It High: the History of the 77th Infantry Division in WWII
All can be accessed from this page.