PORTLAND (Reuters) - As a U.S. Navy veteran, Chris David said he thought he would be able to talk plainly with federal agents in Portland and ask them why they were using unmarked cars to snatch people off the street during recent protests in the Oregon city. When he tried to speak with them outside the federal courthouse in Portland on Saturday night, he said a federal officer beat him with a baton, breaking his hand in two places. A second officer sprayed him with chemical irritant, David said.