Because Duane Hammond’s son is in the Navy, serving on the USS George H W Bush, Mr. Hammond was wearing a shirt and hat featuring the aircraft carrier. He was working as a union stagehand, setting up a President Obama event in Los Angeles. He says that he was asked to turn his shirt inside out, and remove his hat. When he refused, he was fired.

http://www.youtube.com/watch?v=bY2MXEYsrzo