Vice Adm. Ted Branch, the director of naval intelligence, was one of two top officers to have their access to classified material suspended. /U.S. Navy hide caption

itoggle caption /U.S. Navy

Police say Aaron Alexis, who was killed Monday, gunned down 12 people at the Washington Navy Yard. FBI/Reuters/Landov hide caption

itoggle caption FBI/Reuters/Landov

Aaron Alexis, whom the FBI believes to have been responsible for the shootings at the Washington Navy Yard in Washington, D.C., is shown in this handout photo released by the FBI on Monday. FBI/Reuters/Landov hide caption

itoggle caption FBI/Reuters/Landov

King George VI and Queen Elizabeth arrive at the Washington Navy Yard on June 9, 1939, to join President Franklin Roosevelt on a cruise down the Potomac River to Mount Vernon, Va. AP hide caption

itoggle caption AP

Workers emerge from a building after a deadly shooting at the Washington Navy Yard on Monday. There are multiple injuries and deaths, and one gunman is dead. Police say they are searching for two other "potential" shooters. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images

Petty Officer 2nd Class Marissa Gaeta, left, kisses her girlfriend of two years, Petty Officer 3rd Class Citlalic Snell at Joint Expeditionary Base Little Creek in Virginia Beach, Va. Gaeta's ship returned from 80 days at sea on Wednesday. Brian J. Clark/The Virginian-Pilot/AP hide caption

itoggle caption Brian J. Clark/The Virginian-Pilot/AP