(via) On trips to London as a kid I used to mess with the guards in front of Buckingham Palace by pulling faces. Alas, it never happened and I grew up thinking they were completely impervious to distraction. Of course, this is not at all true, but their zen-like concentration was nevertheless impressive in retrospect. On this side of the pond in the United States Air Force, the same cool nerve is required of Ceremonial Guardsmen, who first face off against rubber chickens before being confronted with, you know, children…