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Sgt. First Class Erick Rodriguez stands guard before a news conference by Lt. Gen. Mark Milley at the entrance to Fort Hood Army Post in Texas April 2, 2014. (Credit: Reuters/Erich Schlegel)

Sgt. First Class Erick Rodriguez stands guard before a news conference by Lt. Gen. Mark Milley at the entrance to Fort Hood Army Post in Texas April 2, 2014. (Credit: Reuters/Erich Schlegel)