His options are limited. The bombing campaign is dependent upon his allies in the region continuing to host his air forces. They are no longer particularly enthusiastic. Mounting strikes from the continental United States would be both extremely inefficient, very expensive and lack the flexibility to react and target rapidly. Logistical problems abound, munitions stocks are a problem, both for dropping on Iran and air defence of their allies. Apparently fuel supplies for their non nuclear powered warships are a problem. They have limited ground troops available: 2 Marine Expiditionary units, each of about 2,200 marines, and one airborne brigade, again about 2,000 men. Both are "light infantry" forces with very limitrd supporting arms. Again logistical support is limited. Iran is a large country, with an army several hundred thousand strong, who would be fighting on their home territory, in a war for which they have been preparing for decades. The large and impressive US surface naval fleet would be extremely vulnerable and would suffer considerable damage and casualties if deployed into the restricted waters of the Straits of Hormuz.