And acting upon that lesson in the aftermath of our great victory in World War II, we laid down the Marshall Plan, President Truman did. We got intimately involved in building NATO and other structures there. We still have lots of troops in Europe. And what did we do in the late '40's and '50's and '60's?

Can we draw the following conclusion?
The troops stayed in Europe after the World War II

Choices:
 + Yes;
 + It's impossible to say;
 + No;