If money was not a factor, I would buy a house on an island. Buy and staff an aircraft carrier, a nuclear submarine, a couple Navy SEALS, a few helicopters with lots of rockets, probably get a Gatling gun or two, some anti-aircraft weaponry, surface to air missiles, surface to surface missiles, and air to air missiles. A few nuclear weapons with long range capability. A few hundred thousand rounds of various types of ammo. A few hundred thousand weapons for my own military of 500,000. And a Mossberg 500 in my bedroom and a few Glocks of course for me.
That's just the start.
(And I draw your attention to the correct spelling of the word "defense")