If You Survive by George Wilson. He goes in at D-Day plus 30 and then fights all the way in to Germany as an Infantry Lieutenant.
One thing he really shows is how the U.S. was constantly on the attack-against prepared fighting positions(The Hedgerows, The Breakout, The Hurtgen, The
Siegfried Line etc). This led to a meatgrinder for the Infantry and constant understaffing. As a Second Lieutenant, he was soon in charge of a "Company"
of 60-80 men-mostly newbies. The U.S. had vastly undermanned the Infantry. This led to hurried stripping of non combat units of men, giving them a brief
training session in Infantry tactics and tossing them willy nilly into the front line.The German's doctrinal superiority with machine guns meant that nearly every
step forward cost blood. Without organic mortars, Battalion artillery and to a lesser extent, Airpower, the Germans would have bled us dry.
Wilson thought Lieutenants should be trained in operating at 50% or less strength, and 2 echelons up in rank.