I don't believe anything about this photo was an accident. I assume Obama wanted to send the message that he supports Vietnamese communism and their killing of American soldiers. Our communist leader succeeded in communicating exactly what he thinks of everyone who has ever opposed communism.
HBO had a production some years ago too big to fail. In it, there was a scene where Paulson’s daughter was holding a chinese flag and Paulson had her removed from view saying he did not need the anguish that would cause...bad optics. Here, the black prince is doing just that, except he wants the optics to show this. If they had an anti aircraft gun near by, he would have climbed up on that too.
(had he manned an AA gun, I would wish he would look down the barrel at the time someone decided to shoot off a demo round).