From the publisher:

So far the Soviet, German, British and Italian soldiers in the Sergeants! On the Eastern Front game system have had it pretty much to themselves. Oh, there’s a deadly assortment of mortars, flamethrowers and shaped-charge weapons and that nasty German infantry gun, but it has always been the shoulder weapons that settled the issue and decided the outcome of a scenario. SERGEANTS! – Expansion adds U. S. Army and French soldiers to that reliable mix.