Cmdr. Petta is the associate director for maritime operations and a military professor. He has been a prosecutor, defense counsel, Special Assistant U.S. Attorney, and legal advisor to many operational commands, specializing in maritime pollution response, law enforcement, investigations and the maritime transportation system. Of note, he defended a U.S. Navy chief petty officer wrongly accused of maritime pollution and obtained a half-million-dollar restitution for the U.S. and Canada from a person who fraudulently caused an international search and rescue. He has 29 years of enlisted and commissioned service in the U.S. Navy and U.S. Coast Guard, both at sea and ashore.