North Africa, Sicily, Salerno, Anzio, South France Leyte, Luzon and Normandy were all US Army amphibious assaults. Somehow, the army managed to assault all those beachheads without a single marine unit.
It was the Marine Corps who taught them the amphibious techniques we developed during the ‘20s and ‘30s under Gen. H.M. Smith AND turned them on to the Mike boats and LVTs which we ALSO developed in that time frame. But I was speaking of the modern division of labor, not the past, glorious as it is to the Corps.
The Army also finished WWII with a bigger navy than the Navy...