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In this file photo, flowers decorate a fence outside of Fort Hood's east gate on Sunday, April 6, 2014, in Killeen, Texas, in honor of those killed and wounded in the Fort Hood shooting on April 2. (AP Photo/ Tamir Kalifa) **FILE**

Army: Fort Hood suspect had requested leave

By PAUL J. WEBER - Associated Press

This undated photo provided by Glidden Lopez shows Army Spc. Ivan Lopez. Lopez killed three people and wounded 16 others in a shooting at Fort Hood, Texas, on Wednesday, April 2, 2014, before killing himself. Investigators believe his unstable mental health contributed to the rampage. (AP Photo/Courtesy of Glidden Lopez)

Fort Hood shooter had argued over request for leave

By Paul J. Weber - Associated Press

This undated photo provided by Glidden Lopez shows Army Spc. Ivan Lopez. Authorities said Lopez killed three people and wounded 16 others in a shooting at Fort Hood, Texas, on Wednesday, April 2, 2014, before killing himself. Investigators believe his unstable mental health contributed to the rampage. (AP Photo/Courtesy of Glidden Lopez)

Army may never learn motive of Fort Hood rampage

By WILL WEISSERT and DANICA COTO - Associated Press

This undated photo provided by Glidden Lopez shows Army Spc. Ivan Lopez. Authorities said Lopez killed three people and wounded 16 others in a shooting at Fort Hood, Texas, on Wednesday, April 2, 2014, before killing himself. Investigators believe his unstable mental health contributed to the rampage. (AP Photo/Courtesy of Glidden Lopez)

Fort Hood gunman had argument with other soldiers

By WILL WEISSERT and DANICA COTO - Associated Press