For decades the rules of war seemed clear. If the United States entered a conflict, the outcome was rarely in doubt. The world’s largest military budget, unmatched technological superiority, and a network of global alliances meant that Washington could outfight almost any adversary. But in the opening days of the current confrontation with Iran, something deeply uncomfortable is becoming visible. The United States is not losing battles. Its aircraft still dominate the skies.Its naval fleets still control the seas. Yet beneath this overwhelming military superiority, a quieter crisis is unfolding. The United States is facing what analysts are increasingly calling…