150918-N-AT895-368 ANNAPOLIS Md. (Sept. 18, 2015) Secretary of the Navy (SECNAV) Ray Mabus awards Darleen Greenert a letter of appreciation during a change of office ceremony held at the U.S. Naval Academy. During the ceremony, Adm. Jonathan Greenert is relieved by Adm. John Richardson as Chief of Naval Operations. (U.S. Navy photo by Mass Communication Specialist 1st Class Nathan Laird/Released)