Ken, you're in "small wars thinking" mode.

In great wars 6 months training is unheard of for infantry.
In great wars, lavishly trained peacetime infantry melts away and the few still fit survivors are being sent to NCO school.

You may redefine infantry into something that requires more than six months and more than 3k rounds of ammo, but you'd end up with special forces light.
You wouldn't get enough infantry to at least keep an eye on the whole battlefield in a great war.

(That's why I distinguish between expert infantry in small numbers, reserve infantry a.k.a. national guard for great numbers and recce/scouting-related infantry for very low force density jobs.)