150707-N-AT895-086 WASHINGTON (July 7, 2015) Chief of Naval Operations (CNO) Adm. Jonathan Greenert administers the oath of office to U.S. Rep. Tim Murphy of Pennsylvania. Murphy, who serves in the Navy Reserve Medical Service corps as a psychologist for service members with traumatic brain injuries and post traumatic stress, was promoted to the rank of commander. (U.S. Navy photo by Mass Communication Specialist 1st Class Nathan Laird/Released)