Chief of Naval Operations (CNO) Adm. Jonathan Greenert participates in the unveiling of a memorial plaque at Nationals Park.

WASHINGTON (Apr. 04, 2014) Chief of Naval Operations (CNO) Adm. Jonathan Greenert, 2nd from left, and other Navy officials join Washington, D.C. Mayor Vincent Gray, third from left, Washington Nationals owner Mark Lerner, and Chief of Police Cathy Lanier, third from right, at the unveiling of a memorial plaque at Nationals Park dedicated to the victims of the September 2013 Washington Navy Yard shooting. (U.S. Navy photo by Mass Communications Specialist 2nd Class Pedro Rodriguez) File# 140404-N-ZA795-075