I haven't seen this in a US airport either. I DID see something similar in a British one, though. Soldiers (not guards or police) patrolling the terminal with

I haven't seen this in a US airport either. I DID see something similar in a British one, though. Soldiers (not guards or police) patrolling the terminal with (to my eyes) very large guns. They also seemed to be in "spread out"-formation, keeping their distance from each other. A measure I would have thought was reserved where more caution was needed, e.g. street patrolling in a war-zone. A rather unnerving sight, actually.