Basically, the former green beret told him he didn't belong at the wall and he was there to escort him away. After being told to step away by a Secret Service agent, the guy took his coat off revealing his anti-Kerry t-shirt. At that point (in front of a group of children and others) Kerry flipped the guy the obscene gesture. Real professional.
Now Akami, please spare me any comments that start off with anything similar to , "OH YEAH... well Bush did __________ (fill in the blank), so he's a big stupid head."