The Iran war has broken the US Navy's supply chain in the region, leaving sailors worn down and American allies in Asia suddenly exposed.

• Iranian missiles wrecked the Navy's main base in Bahrain on the war's first day, forcing resupply to shift to a tiny island thousands of miles away.
• Carriers now go months without a port call, and crews are short on fresh food and running on almost no rest.
• The Navy gutted its own supply ship fleet after the Cold War, betting on regional bases that Iran has now knocked out.
• The last US carrier in Asia is being pulled to the Middle East, and Trump is cutting joint drills with South Korea while praising Kim Jong-un.
• Allies are drawing the obvious lesson: South Korea, Japan, Poland and Saudi Arabia all have stronger reasons to seek nuclear weapons or new defense pacts.

Outlook: Iran looks likely to press its advantage rather than wait out a slow squeeze, while US allies quietly hedge toward China and their own deterrents.