[GBA]

Is there some reason, Constitutional or otherwise, why our military doesn't patrol this area and others like it?

[Righty1]

The reason is that both parties are pandering to the hispanic vote. The pentagon also doesn't want this job as it would tie them down and expose them to endless bad pub and second guessing from "immigrants rights" lawyers.

[Shooter 2.5]

The military was used until a shepard who was using a .22 for target practice was mistaken for a bad guy and killed.
The troops were removed from the border soon after that.