With decades of experience in security and counter-terrorism intelligence work, Burton said the mission to evacuate is one of the most complex he has seen.
"The logistics behind this is something that I don't think I've seen in my career at this scope in such a deteriorating environment," Burton said.
He calls it "deteriorating" because of the scramble to get so many people out of the country before Aug. 31, while the intelligence community warns of threats of violence.
