How many rounds did US Army infantry carry on a beach landing? One belt of 10, 8 round clips? two belts? How many grenades?
The basic low-level tactical infantry unit in World War II was the Rifle Squad, and it is more valuable to think in terms of the ammunition carried by such a squad. The typical (rifle and pistol) rounds carried by a Rifle Squad of 8-10 men is there listed as 1500-1600 rounds, which is 150-200 rounds per man.