The lack of reliable intelligence leaves military planners, given the goal of totally destroying the sites, little choice but to consider the use of tactical nuclear weapons. “Every other option, in the view of the nuclear weaponeers, would leave a gap,” the former senior intelligence official said. “ ‘Decisive’ is the key word of the Air Force’s planning. It’s a tough decision. But we made it in Japan.”

He went on, “Nuclear planners go through extensive training and learn the technical details of damage and fallout—we’re talking about mushroom clouds, radiation, mass casualties, and contamination over years. This is not an underground nuclear test, where all you see is the earth raised a little bit. These politicians don’t have a clue, and whenever anybody tries to get it out”—remove the nuclear option—“they’re shouted down.”

The attention given to the nuclear option has created serious misgivings inside the offices of the Joint Chiefs of Staff, he added, and some officers have talked about resigning. Late this winter, the Joint Chiefs of Staff sought to remove the nuclear option from the evolving war plans for Iran—without success, the former intelligence official said. “The White House said, ‘Why are you challenging this? The option came from you.’ ”

The Pentagon adviser on the war on terror confirmed that some in the Administration were looking seriously at this option, which he linked to a resurgence of interest in tactical nuclear weapons among Pentagon civilians and in policy circles. He called it “a juggernaut that has to be stopped.” He also confirmed that some senior officers and officials were considering resigning over the issue. “There are very strong sentiments within the military against brandishing nuclear weapons against other countries,” the adviser told me. “This goes to high levels.” The matter may soon reach a decisive point, he said, because the Joint Chiefs had agreed to give President Bush a formal recommendation stating that they are strongly opposed to considering the nuclear option for Iran. “The internal debate on this has hardened in recent weeks,” the adviser said. “And, if senior Pentagon officers express their opposition to the use of offensive nuclear weapons, then it will never happen.”

The adviser added, however, that the idea of using tactical nuclear weapons in such situations has gained support from the Defense Science Board, an advisory panel whose members are selected by Secretary of Defense Donald Rumsfeld. “They’re telling the Pentagon that we can build the B61 with more blast and less radiation,” he said.

The chairman of the Defense Science Board is William Schneider, Jr., an Under-Secretary of State in the Reagan Administration. In January, 2001, as President Bush prepared to take office, Schneider served on an ad-hoc panel on nuclear forces sponsored by the National Institute for Public Policy, a conservative think tank. The panel’s report recommended treating tactical nuclear weapons as an essential part of the U.S. arsenal and noted their suitability “for those occasions when the certain and prompt destruction of high priority targets is essential and beyond the promise of conventional weapons.” Several signers of the report are now prominent members of the Bush Administration, including Stephen Hadley, the national-security adviser; Stephen Cambone, the Under-Secretary of Defense for Intelligence; and Robert Joseph, the Under-Secretary of State for Arms Control and International Security.

[Seymour M. Hersh, The Iran Plans, The New Yorker, 10. April 2006]