Yah, but once off of the base boundaries, what can the Marines and their helicopters do? Continue to pursue and hand off to Sheriffs if called in for support? They ain't got time for dat.To actually catch people will take helicopters and they do have them.
Dunno, if it becomes too much of a big deal it might get elevated. Gov't likes to spend our hard earned money. They won't close the borders but I betcha they will sure as hell give it there best shot (pun intended) to close off the area. Build a fence to keep King Kong out