FORT HOOD, TX - NOVEMBER 10:  U.S. Army soldiers stand together as they pray at the start of the memorial service that U.S. President Barack Obama and first lady Michelle Obama are attending for the thirteen victims of the shooting rampage by U.S. Army Major Nidal Malik Hasan on November 10, 2009 in Fort Hood, Texas. Hasan, an army psychiatrist, killed 13 people and wounded 30 in a shooting at the military base on November 5, 2009. Getty Images logo Getty Images 1 week ago

FORT HOOD, TX - NOVEMBER 10: U.S. Army soldiers stand together as they pray at the start of the memorial service that U.S. President Barack Obama and first lady Michelle Obama are attending for the thirteen victims of the shooting rampage by U.S. Army Major Nidal Malik Hasan on November 10, 2009 in Fort Hood, Texas. Hasan, an army psychiatrist, killed 13 people and wounded 30 in a shooting at the military base on November 5, 2009.