Examples, please. Plural, as you said "outright falsehoods." Unless you're going to use the tired old line of, "No weapons of mass destruction were found!" They were there, every knowledgeable Western intelligence agency in the world knew it and reported it, and afterward the weapons were moved because Saddam had literally MONTHS of advance notice. So don't use "no WMD found!" as an example because it isn't outright and it isn't a falsehood. Simply cite here examples of Cheney's "outright falsehoods about national security threats."
All of Cheney's references to a "mushroom shaped cloud" suggesting that Saddam had nuclear WMD, for which suggestion there never was any factual basis. When the U.S. armies invaded Iraq the Iraqi nuclear weapons program was still under U.N. seal, just as the inspectors left it when Bush's invasion forced the U.N. to leave.