Sergeant Gary Stein, 26, a weather forecaster assigned to Camp Pendleton near San Diego, cast the Marines' reaction to his comments as an infringement on his freedom of speech and defended his right to express personal political opinions when he is off-duty and out of uniform.

"There is not a document in this world that trumps the United States Constitution," the San Diego Union-Tribune quoted him as saying.

But Army veteran Rick Rogers, host of the San Diego military talk radio show "Front & Center," said Stein appeared to be instigating a confrontation with the Marines "to get notoriety." Stein previously ran afoul of the military over comments on his Armed Forces Tea Party page in 2010.