Artificial intelligence has transformed what the US military can do from a distance but the Iran war has also shown how the physical world still imposes major barriers to victory, say two observers. WASHINGTON: In Washington, planning for a war with Iran always started with the same stubborn reality: It would be hard to fight and even harder to win. The country is vast and mountainous. Much of its military infrastructure is buried in caves and bunkers. Any serious plan to neutralise Iran’s