does 101st infantry train for chemical attacks in NBC suits, Or do they do it at all?

Everyone trains in MOPP gear. Not just the soldiers assigned to the 101st.

Even the personnel and finance people do it. Try typing in MOPP 4, its not fun.

Yes. It is not Army specific.

yes, everyone has to train in NBC suits from time to time

they used to do it more in units based in europe, than stateside units had to

What do you think makes the 101st special?
EVERYONE has to do the same training in chem gear before they deploy.