The defensive-lethal language led some Democrats, according to congressional sources familiar with their views, to call in the director of the C.I.A., Air Force General Michael V. Hayden, for a special briefing. Hayden reassured the legislators that the language did nothing more than provide authority for Special Forces operatives on the ground in Iran to shoot their way out if they faced capture or harm.

The legislators were far from convinced. One congressman subsequently wrote a personal letter to President Bush insisting that “no lethal action, period” had been authorized within Iran’s borders. As of June, he had received no answer.

Members of Congress have expressed skepticism in the past about the information provided by the White House. On March 15, 2005, David Obey, then the ranking Democrat on the Republican-led House Appropriations Committee, announced that he was putting aside an amendment that he had intended to offer that day, and that would have cut off all funding for national-intelligence programs unless the President agreed to keep Congress fully informed about clandestine military activities undertaken in the war on terror. He had changed his mind, he said, because the White House promised better coöperation. “The Executive Branch understands that we are not trying to dictate what they do,” he said in a floor speech at the time. “We are simply trying to see to it that what they do is consistent with American values and will not get the country in trouble.”

Obey declined to comment on the specifics of the operations in Iran, but he did tell me that the White House reneged on its promise to consult more fully with Congress. He said, “I suspect there’s something going on, but I don’t know what to believe. Cheney has always wanted to go after Iran, and if he had more time he’d find a way to do it. We still don’t get enough information from the agencies, and I have very little confidence that they give us information on the edge.”

None of the four Democrats in the Gang of Eight—Senate Majority Leader Harry Reid, House Speaker Nancy Pelosi, Senate Intelligence Committee chairman John D. Rockefeller IV, and House Intelligence Committee chairman Silvestre Reyes—would comment on the Finding, with some noting that it was highly classified. An aide to one member of the Democratic leadership responded, on his behalf, by pointing to the limitations of the Gang of Eight process. The notification of a Finding, the aide said, “is just that—notification, and not a sign-off on activities. Proper oversight of ongoing intelligence activities is done by fully briefing the members of the intelligence committee.” However, Congress does have the means to challenge the White House once it has been sent a Finding. It has the power to withhold funding for any government operation. The members of the House and Senate Democratic leadership who have access to the Finding can also, if they choose to do so, and if they have shared concerns, come up with ways to exert their influence on Administration policy. (A spokesman for the C.I.A. said, “As a rule, we don’t comment one way or the other on allegations of covert activities or purported findings.” The White House also declined to comment.)

A member of the House Appropriations Committee acknowledged that, even with a Democratic victory in November, “it will take another year before we get the intelligence activities under control.” He went on, “We control the money and they can’t do anything without the money. Money is what it’s all about. But I’m very leery of this Administration.” He added, “This Administration has been so secretive.”

One irony of Admiral Fallon’s departure is that he was, in many areas, in agreement with President Bush on the threat posed by Iran. They had a good working relationship, Fallon told me, and, when he ran CENTCOM, were in regular communication. On March 4th, a week before his resignation, Fallon testified before the Senate Armed Services Committee, saying that he was “encouraged” about the situations in Iraq and Afghanistan. Regarding the role played by Iran’s leaders, he said, “They’ve been absolutely unhelpful, very damaging, and I absolutely don’t condone any of their activities. And I have yet to see anything since I’ve been in this job in the way of a public action by Iran that’s been at all helpful in this region.”

Fallon made it clear in our conversations that he considered it inappropriate to comment publicly about the President, the Vice-President, or Special Operations. But he said he had heard that people in the White House had been “struggling” with his views on Iran. “When I arrived at CENTCOM, the Iranians were funding every entity inside Iraq. It was in their interest to get us out, and so they decided to kill as many Americans as they could. And why not? They didn’t know who’d come out ahead, but they wanted us out. I decided that I couldn’t resolve the situation in Iraq without the neighborhood. To get this problem in Iraq solved, we had to somehow involve Iran and Syria. I had to work the neighborhood.”

Fallon told me that his focus had been not on the Iranian nuclear issue, or on regime change there, but on “putting out the fires in Iraq.” There were constant discussions in Washington and in the field about how to engage Iran and, on the subject of the bombing option, Fallon said, he believed that “it would happen only if the Iranians did something stupid.”

Fallon’s early retirement, however, appears to have been provoked not only by his negative comments about bombing Iran but also by his strong belief in the chain of command and his insistence on being informed about Special Operations in his area of responsibility. One of Fallon’s defenders is retired Marine General John J. (Jack) Sheehan, whose last assignment was as commander-in-chief of the U.S. Atlantic Command, where Fallon was a deputy. Last year, Sheehan rejected a White House offer to become the President’s “czar” for the wars in Iraq and Afghanistan. “One of the reasons the White House selected Fallon for CENTCOM was that he’s known to be a strategic thinker and had demonstrated those skills in the Pacific,” Sheehan told me. (Fallon served as commander-in-chief of U.S. forces in the Pacific from 2005 to 2007.) “He was charged with coming up with an over-all coherent strategy for Iran, Iraq, and Afghanistan, and, by law, the combatant commander is responsible for all military operations within his A.O.”—area of operations. “That was not happening,” Sheehan said. “When Fallon tried to make sense of all the overt and covert activity conducted by the military in his area of responsibility, a small group in the White House leadership shut him out.”

The law cited by Sheehan is the 1986 Defense Reorganization Act, known as Goldwater-Nichols, which defined the chain of command: from the President to the Secretary of Defense, through the chairman of the Joint Chiefs of Staff, and on to the various combatant commanders, who were put in charge of all aspects of military operations, including joint training and logistics. That authority, the act stated, was not to be shared with other echelons of command. But the Bush Administration, as part of its global war on terror, instituted new policies that undercut regional commanders-in-chief; for example, it gave Special Operations teams, at military commands around the world, the highest priority in terms of securing support and equipment. The degradation of the traditional chain of command in the past few years has been a point of tension between the White House and the uniformed military.

“The coherence of military strategy is being eroded because of undue civilian influence and direction of nonconventional military operations,” Sheehan said. “If you have small groups planning and conducting military operations outside the knowledge and control of the combatant commander, by default you can’t have a coherent military strategy. You end up with a disaster, like the reconstruction efforts in Iraq.”

Admiral Fallon, who is known as Fox, was aware that he would face special difficulties as the first Navy officer to lead CENTCOM, which had always been headed by a ground commander, one of his military colleagues told me. He was also aware that the Special Operations community would be a concern. “Fox said that there’s a lot of strange stuff going on in Special Ops, and I told him he had to figure out what they were really doing,” Fallon’s colleague said. “The Special Ops guys eventually figured out they needed Fox, and so they began to talk to him. Fox would have won his fight with Special Ops but for Cheney.”

The Pentagon consultant said, “Fallon went down because, in his own way, he was trying to prevent a war with Iran, and you have to admire him for that.”

In recent months, according to the Iranian media, there has been a surge in violence in Iran; it is impossible at this early stage, however, to credit JSOC or C.I.A. activities, or to assess their impact on the Iranian leadership. The Iranian press reports are being carefully monitored by retired Air Force Colonel Sam Gardiner, who has taught strategy at the National War College and now conducts war games centered on Iran for the federal government, think tanks, and universities. The Iranian press “is very open in describing the killings going on inside the country,” Gardiner said. It is, he said, “a controlled press, which makes it more important that it publishes these things. We begin to see inside the government.” He added, “Hardly a day goes by now we don’t see a clash somewhere. There were three or four incidents over a recent weekend, and the Iranians are even naming the Revolutionary Guard officers who have been killed.”

Earlier this year, a militant Ahwazi group claimed to have assassinated a Revolutionary Guard colonel, and the Iranian government acknowledged that an explosion in a cultural center in Shiraz, in the southern part of the country, which killed at least twelve people and injured more than two hundred, had been a terrorist act and not, as it earlier insisted, an accident. It could not be learned whether there has been American involvement in any specific incident in Iran, but, according to Gardiner, the Iranians have begun publicly blaming the U.S., Great Britain, and, more recently, the C.I.A. for some incidents. The agency was involved in a coup in Iran in 1953, and its support for the unpopular regime of Shah Mohammed Reza Pahlavi—who was overthrown in 1979—was condemned for years by the ruling mullahs in Tehran, to great effect. “This is the ultimate for the Iranians—to blame the C.I.A.,” Gardiner said. “This is new, and it’s an escalation—a ratcheting up of tensions. It rallies support for the regime and shows the people that there is a continuing threat from the ‘Great Satan.’ ” In Gardiner’s view, the violence, rather than weakening Iran’s religious government, may generate support for it.

Many of the activities may be being carried out by dissidents in Iran, and not by Americans in the field. One problem with “passing money” (to use the term of the person familiar with the Finding) in a covert setting is that it is hard to control where the money goes and whom it benefits. Nonetheless, the former senior intelligence official said, “We’ve got exposure, because of the transfer of our weapons and our communications gear. The Iranians will be able to make the argument that the opposition was inspired by the Americans. How many times have we tried this without asking the right questions? Is the risk worth it?” One possible consequence of these operations would be a violent Iranian crackdown on one of the dissident groups, which could give the Bush Administration a reason to intervene.

A strategy of using ethnic minorities to undermine Iran is flawed, according to Vali Nasr, who teaches international politics at Tufts University and is also a senior fellow at the Council on Foreign Relations. “Just because Lebanon, Iraq, and Pakistan have ethnic problems, it does not mean that Iran is suffering from the same issue,” Nasr told me. “Iran is an old country—like France and Germany—and its citizens are just as nationalistic. The U.S. is overestimating ethnic tension in Iran.” The minority groups that the U.S. is reaching out to are either well integrated or small and marginal, without much influence on the government or much ability to present a political challenge, Nasr said. “You can always find some activist groups that will go and kill a policeman, but working with the minorities will backfire, and alienate the majority of the population.”