Delta guys have flown in and out of Beiruit International. In fact, as soon as I read the referenced quote, Delta was the first group that came to mind. Offhand, I’d say they know their way around Beiruit better than any other US paramilitary organization, given their experience escorting State types from zone to zone.
I don’t see Delta operating in Damascus though. My gut says there’s only one outfit with the numbers, experience and infrastructure necessary to operate covertly and violently there. Starts with an “M”.