US President Barack Obama addresses the Fallen Soldier Memorial at the III Corps & Fort Hood Memorial Ceremony on November 10, 2009 in Killeen, Texas, honoring those killed November 5, 2009 at Fort Hood. US Army Major Nidal Malik Hasan, 39, a psychiatrist and specialist in combat stress, allegedly killed 13 people and wounded 42 in the shooting rampage. Getty Images logo Getty Images 27 months ago

US President Barack Obama addresses the Fallen Soldier Memorial at the III Corps & Fort Hood Memorial Ceremony on November 10, 2009 in Killeen, Texas, honoring those killed November 5, 2009 at Fort Hood. US Army Major Nidal Malik Hasan, 39, a psychiatrist and specialist in combat stress, allegedly killed 13 people and wounded 42 in the shooting rampage.