Current Republican Congressman states that "we see the [9/11] investigations that have been done so far as more or less cover-up and no real explanation of what went on"
Former U.S. Republican Congressman, who is a senior member of the House Armed Services Committee, and who served six years as Chairman of the Military Research and Development Subcommittee (see also this statement, and this one)
Deputy Assistant Secretary of Defense under President Ronald Reagan (his conservative credentials are evident in his bio)
Former high-ranking official under George W. Bush, and former director of the Criminal Justice Center at the National Center for Policy Analysis
Former high-ranking official under Ronald Reagan, who is a highly influential conservative (see also this essay)
Former Air Force Colonel and Pentagon official, who was part of the influential Office of Special Plans, and who was at the Pentagon on 9/11
Current U.S. Senator states "The two questions that the congress will not ask . . . is why did 9/11 happen on George Bush's watch when he had clear warnings that it was going to happen? Why did they allow it to happen?"
Former director of the U.S. "Star Wars" space defense program in both Republican and Democratic administrations, who was a senior air force colonel who flew 101 combat missions (see also this statement)
Former ambassador to Iraq Joseph Wilson
Current congresswoman, former senior CIA analyst, former Deputy Secretary for Intelligence and Warning under Nixon, Ford, and Carter, former US Ambassador and Chief of Mission to Iraq, former Deputy Director to the White House Task Force on Terrorism, and former US Department of State Foreign Service Officer (as well as a who's who of liberals and independents)
Pentagon Papers whistleblower Daniel Ellsberg
UNKNOWN OR NON-U.S. Former Two-Star general
Former 20-year Marine Corps infantry and intelligence officer, the second-ranking civilian in U.S. Marine Corps Intelligence, and former CIA clandestine services case officer stated that "9/11 was at a minimum allowed to happen as a pretext for war", and it was probably an inside job (see Customer Review dated October 7, 2006).
Former FBI translator, who the Department of Justice's Inspector General and several senators have called extremely credible (free subscription required), said "If they were to do real investigations we would see several significant high level criminal prosecutions in this country. And that is something that they are not going to let out. And, believe me; they will do everything to cover this up". She also is leaning towards the conclusion that 9/11 was an inside job
Former Canadian Minister of Defense
Two former MI5 (British intelligence) agents (19 minutes into video)
High-ranking general and the former chief of NATO (in Danish; hint -- he mentions bombs in the Twin Towers)
The commander-in-chief of the Russian Air Force; and see also statement of former chief of staff of the Russian armed forces