The former Navy SEAL who just wrote a book about the Osama bin Laden raid is in violation of the non-disclosure agreements he signed, the Department of Defense General Counsel said Thursday. General Counsel Jeh Johnson wrote in a letter to "MarkOwen,"the author’s pen name, that by selling his book he aggravates the violation. "We've got to get serious about leaks ofclassifiedinformation,"a senior Defense official told NBC News. "As unpalatable as it may seem to go after this Navy SEAL, if we do nothing there is no deterrence, nothing to prevent others from doing the same."