The US population possesses over 300 million guns. Most of these gun holders are very independent and strongly identify with the US Constitution. Regardless of any governmental or economic collapse, the majority of the people would not tolerate any foreign influence or takeover. Long before any foreign takeover attempt took place, America would engage in a 2nd civil war to reestablish what the founding fathers envisioned for our country: a constitutional republic.
One procedure anyone can do on themselves is to remove metal "suture" staples after a wound/surgical incision has healed. Just get some tweezers and a set of wire snips.Disinfect both. Snip the staples in the middle and remove both parts with the tweezers. Trust me it's quite painless and saves a few hundred dollars.