member, took issue with a February 2011 revision of the 2007 National Intelligence Estimate on Iran's nuclear weapons program in a Wall Street Journal op-ed titled "America's Intelligence Denial on Iran." In the op-ed, Fleitz claimed the new estimate had serious problems and underplayed the threat from Iran's pursuit of nuclear weapons program much as the 2007 version did. However, Fleitz stated that he was not permitted by CIA censors to discuss his specific concerns about the estimate. Fleitz also claimed the estimate had a four-member outside review board that he viewed as biased since three of the reviewers held the same ideological and political views and two of them were from the same Washington DC think tank. He noted that the CIA prevented him from releasing the names of the outside reviewers of the 2011 Iran estimate. Several high U.S. military and intelligence officials have stated that the effects of an Israeli attack on Iran's nuclear facilities would not be preventive. Defense Secretary Leon E. Panetta said in December 2011, and Lt. Gen. James R. Clapper, director of National Intelligence, said in February 2012 that an Israeli attack would only delay Iran's program by one or two years. General Michael V. Hayden, former CIA Director, said in January 2012 that Israel was not able to inflict significant damage on Iran's nuclear sites. He said, "They only have the ability to make this worse." In February 2012, Admiral William J. Fallon, who retired in 2008 as head of U.S. Central Command, said, "No one that I'm aware of thinks that there's any real positive outcome of a military strike or some kind of conflict." He advocated negotiating with Iran and deterring Iran from aggressive actions and said, "Let's not precipitate something." General Martin Dempsey, Chairman of the Joint Chiefs of Staff, said in August 2012 that a unilateral Israeli attack on Iran would delay but not destroy Iran's nuclear program and that he did not wish to be "complicit" in such an attack. He also stated that sanctions were having an effect and should be given time to work, and that a premature attack might damage the 'international coalition' against Iran. Former Defense Secretary and former CIA Director Robert Gates stated in October 2012 that sanctions were beginning to have an effect and that "the results of an American or Israeli military strike on Iran could, in my view, prove