Ceremony honors Navy Yard victims

U.S. Secretary of Defense Chuck Hagel, right, and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, left, lay a wreath in honor of the Navy Yard shooting victims, at the U.S. Navy Memorial in Washington, D.C., Sept. 17, 2013.

Twelve people were killed, as well as the gunman, during Monday's shooting at the Navy Yard in Washington.

(L-R) Chief of Naval Operations Jonathan Greenert, Navy Secretary Ray Maybus, Vice Chairman of the Joint Chiefs of Staff Sandy Winnfeld, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, and U.S. Secretary of Defense Chuck Hagel participate in a wreath laying ceremony to honor the Navy Yard shooting victims, Sept. 17, 2013.

Chief of Naval Operations Jonathan Greenert, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Navy Secretary Ray Maybus, U.S. Secretary of Defense Chuck Hagel, and Vice Chairman of the Joint Chiefs of Staff Sandy Winnfeld arrive for a wreath laying ceremony in honor of the Navy Yard shooting victims, at the U.S. Navy Memorial, Sept. 17, 2013.

Wreaths are placed at the U.S. Navy Memorial to honor the Navy Yard shooting victims, Sept. 17, 2013.

Washington D.C. Mayor Vincet Gray looks on during the wreath laying ceremony, Sept. 17, 2013.

U.S. Secretary of Defense Chuck Hagel (R) stands during a moment of silence after laying a wreath at the U.S. Navy Memorial, Sept. 17, 2013.

(L-R) Chief of Naval Operations Jonathan Greenert, Navy Secretary Ray Maybus, Vice Chairman of the Joint Chiefs of Staff Sandy Winnfeld, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, and U.S. Secretary of Defense Chuck Hagel participate in a wreath laying ceremony to honor of the Navy Yard shooting victims, Sept. 17, 2013.

U.S. Secretary of Defense Chuck Hagel, far right, gathers with Navy personel during a wreath laying ceremony to honor the Navy Yard shooting victims, Sept. 17, 2013.

U.S. Secretary of Defense Chuck Hagel (R) and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, (L) lay a wreath in honor of the Navy Yard shooting victims, Sept. 17, 2013.