General Richard Myers has been bitten once. He was America's top soldier during the Iraq war, the war in which his soldiers failed to find the weapons of mass destruction that weren't there.
So you might think he'd be cautious. But he's not, about Syria at least.
I met him just hours after President Barack Obama had delivered a very personal warning to Bashar al-Assad about chemical weapons:
Myers listened to Obama at the National Defence University and, in a room there, lined with the memorabilia of conflict from the War of Independence to war today, he told me the real threat was not from Assad using these weapons but from Islamist groups using them, after taking the bases where they are stockpiled.
American intelligence has been wrong so many times but on Syria it seems too confident.
Images from American drones and intelligence gleaned from communications intercepts suggest that some of Syria's huge stockpiles of chemical weapons are being moved again. This may be to protect them from capture. Or it may be to prepare them for use.
That is what Senator John McCain believes. He is of course a hawk on Syria as on Afghanistan and on most other military matters.
Under the Rotunda dome of his Capitol Hill bunker, the old soldier told me: "This is an escalation by Assad...he may be preparing that capability. This is very, very, very dangerous."
It hardly bears repetition.
American forces have what they call contingency planning to secure chemical weapons bases in Syria. It would take thousands, probably tens of thousands of troops. The US isn't going to send them in any time soon.
So far, America won't even arm rebels or recognise the new opposition coalition. But alarms bells are ringing around the domes of Capitol Hill and in the corridors of the White House. They know they were wrong on Iraq. They can't afford to be wrong twice.