Pence mentioned "Frontier Regulars" during his National Space Council remarks.
https://en.wikipedia.org/wiki/Army_on_the_Frontier
-
guarding the frontier settlements in forts from hostile indigenous peoples;
-
aiding the settlement of the West by developing and protecting the communication between the older settlements and the frontier, by exploring the West, constructing roads and defending the overland trails, water routes and later telegraph and railroad lines;
-
policing the frontier until the civil governments could maintain order.
sounds like we could use some Frontier Regulars on the southern border.