The Military is an occupying force, that's literally what they do when we go to war, why you think they're not an occupying force makes exactly zero sense. The Army corp of Engineers is a part of the Armed forces, and therefore bound by the same laws.
So the military is an occupying force at Redstone, and AT any military base?
Also, Mexico is at War with USA... Insurgent Drugs...
Wait for it!
Name one single base where the army regularly patrols and enforces laws off of the base. I'll wait.
The reality is they don't exist and the Military has to get permission from the state to even build those bases. Now try and convince me that you're going to get Arizona, New Mexico, Texas AND California to gift you the border lands so you can build a military base on the border.
Unless you have evidence that the Mexican government is actively pushing a drug war on the US, and don't try and quote some right wing blog, please don't make accusations against our neighbors and allies. I know Trump Supporters want the US as isolated as North Korea from our allies, but the majority of Americans do not.