I agree @Pipefag.  Pull them the fuck out of Afghanistan, Yemen, Syria, most of Europe and Korea.  Build bases along the border and run patrols and training exercises in the areas where a wall isn't needed but periodic patrolling is.  Use the military to protect our shores - it's why we have one.  Then the money spent by soldiers will be spend in the continental US.  The cost to deploy and redeploy drops to virtually nothing.  Shift the cost of all that deployment to completing the wall, upgrading tech and declare the amount of area along the border needed to build bases and support facilities as federal under the rule of imminent domain.  All that money infused into those areas will bring jobs for Americans while securing our sovereignty. Add to that, ending chain migration, Visa lottery, and DACA.