Loved ones and family of the Navy Yard shooting victims listen to music during a memorial service at the Marine Barracks on September 22, 2013 in Washington. US President Barack Obama, Defense Secretary Chuck Hagel and others attended the memorial to honor the 12 victims of the shooting at the Washington Navy Yard by Aaron Alexis. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)