Some estimates show the U.S. has used more than half of its stockpiles of some weapons systems in the war with Iran. The Center for Strategic and International Studies found the U.S. has enough missiles to continue fighting in Iran under any plausible scenario, but the group says the true issue with the shrinking stockpiles is future wars.

“We can go on against Iran for quite a long time, even if we’ve used half the inventory. That means that half the inventories are still available,” said Mark Cancian, a retired U.S. Marines colonel and senior advisor with the CSIS Defense and Security Department.

“The risk is about a future conflict in the…

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