The 2007 picture provided by the Uniformed Services University of the Health Sciences shows Nidal Malik Hasan when he entered the program for his Disaster and Military Psychiatry Fellowship. Authorities said he went on the killing spree at Fort Hood, Texas, which left 13 people dead. (Associated Press/Uniformed Services University of the Health Sciences)

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The 2007 picture provided by the Uniformed Services University of the Health Sciences shows Nidal Malik Hasan when he entered the program for his Disaster and Military Psychiatry Fellowship. Authorities said he went on the killing spree at Fort Hood, Texas, which left 13 people dead. (Associated Press/Uniformed Services University of the Health Sciences)