Hoiwever, training during combat is important and several Divisions other than the 3d were good at it. Most of the Armored Divisions did it. The 1st Mar Div in Korea had an excellent combat training, and NCO training program once the line stabilized and they were rigorous in sending people to those programs.

As you note, in Viet Nam it was far more discretionary at unit level. The 1st Bde of the 101st as a Separate Brigade in 1965-67 had in-country training and an NCO course also. It can be done -- should be done -- and good units will do it in spite of the impediments or lack of an overarching system plan.