U.S. has no realistic military options against Iran
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When discussing Iran, President George W. Bush commonly insists that "all options are on the table" -- a not-so-subtle reminder that Washington might use force against Tehran if all else fails. This threat overlooks the fact that the United States has no realistic military option against Iran. To protect its nuclear facilities from possible U.S. strikes, Iran has dispersed them throughout the country and placed them deep underground. Any U.S. attack would thus have to overcome both intelligence-related challenges (how to find the sites) and thorny logistical ones (how to hit them). (As the Iraq debacle has shown, U.S. intelligence is not always as reliable as it should be.) And even a successful military attack would not end the mullahs' nuclear ambitions; it would only motivate them to rebuild the destroyed facilities, and to do so with even less regard for Iran's treaty obligations.
Even if Iran's nuclear facilities were severely damaged during an attack, it is possible that Iran could embark on a crash programme to make one nuclear weapon. In the aftermath of an attack, it is likely that popular support for an Iranian nuclear weapon capability would increase; bolstering the position of hardliners and strengthening arguments that Iran must possess a nuclear deterrent. Furthermore, Iran has threatened to withdraw from the NPT and, should it do so post-attack, would build a clandestine programme free of international inspection and control.