Stupidity: There are numerous snipers on and around the White House. They should have barraged the lawn and wiped out all the attackers on foot with rifles and machine gun fire.
Stupidity: The air defences in Washington fire once and then stop. They should have barraged that plane repeatedly until it went down.
Answer: Forbes slipped up by mentioning the head bad guy's name. And, as good an agent as Forbes was, it is highly doubtful, not to mention suspicious, that he'd still be roaming around by himself this long after the fall of the White House. Plus Mike ain't stupid and most likely smelled a rat. And he was correct. Forbes was dirty.
Alan Keddie