160510-N-AT895-169 WASHINGTON (May 10, 2016) Chief of Naval Operations (CNO) Adm. John Richardson talks with Bill Dawson, the last surviving member of the very first Naval Combat Demolition Unit (NCDU) during Navy appreciation night at Nationals Park. NCDUs were the precursor of the Underwater Demolition Teams (UDT) and today's Navy SEALs. Richardson administered the oath of enlistment to future Sailors from Navy Recruiting District (NRD) Richmond, met with the Sailors of the Year and took part in a special salute to military members. (U.S. Navy photo by Mass Communication Specialist 1st Class Nathan Laird/Released)