The United States Military is the most terrifying institution of force in the history of the human race (history of the universe as far as we know). It achieves a level of training, discipline, organization, morale, combat effectiveness and general formidavlbility that makes the median Marine among the best soldiers on the planet anywhere, all backed by a logistical apparatus unrivaled by any conceivable combination of private sector actors working together. Unrivaled now, maybe ever.
And it got its ass kicked in Afghanistan. Trillions of dollars and countless lives later and a bunch of Pashtun tribesmen with AK-47s and RPG-7s have the country back, and a bunch of our materiel for our trouble.
Because the only thing on the planet more dangerous than a United States Special Forces operator is a man with nothing to lose.