Loved ones and family members of the Navy Yard shooting victims and others listen as US President Barack Obama speaks during a memorial service at the Marine Barracks September 22, 2013 in Washington, DC. Obama, US Secretary of Defense Chuck Hagel and others attended the memorial to honor victims of the September 16, 2013 shooting at the Washington Navy Yard that took the lives of 12 people. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)