Anyway, we have our military in numerous countries guarding borders and sections of certain regions to PREVENT hostile action.Where it's worked: the old inter-German border region, Kosovo (stopping the VJ from bringing their tanks back into the area), and Korea (at least as far as stopping massed assaults by armored and mechanized infantry armies.)
Where it hasn't worked: Kosovo (stopping the KLA), Korea (stopping saboteurs and spies from crossing the DMZ), Vietnam.
Which set of situations is closer to the situation on the US-Mexican border?
It's pretty obvious that each police action has it's own set of unique circumstances and problems. It doesn't matter how our border situation with Mexico compares to Korea or Kosovo, what does matter is our future course of action to protect our borders from unwanted incursions. I do not condone using our military as policemen for several reasons, but our idiotic approach to solidifying our borders have made it so easy for all types of creatures to enter and endanger our well being that until some sanity is restored I suggest we use the most effective means necessary.