I think we need the Frontier Battalion reconstituted. I think it's long past time for "thinning out" the badmen who run the border.
The Special Force actually went cross border to take out bad guys from time to time.
Lots of history and short stories here
http://www.texasranger.org/history/Timeenforce.htm
The more things change, the more they stay the same, seems the "lawless border" is making a comeback. MAy take the US Army to sort it all out, just like olden days.