Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood. A Muslim, he has refused a judge's order to shave his beard, though it violates Army regulations. Bell County Sheriff's Office/Reuters/Landov hide caption

itoggle caption Bell County Sheriff's Office/Reuters/Landov

Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood. A Muslim, he has refused a judge's order to shave his beard, though it violates Army regulations. The trial will proceed, however. Bell County Sheriff's Office/Reuters/Landov hide caption

itoggle caption Bell County Sheriff's Office/Reuters/Landov

An undated handout photo of Maj. Nidal Hasan, who is accused of killing 13 people at Fort Hood, Texas, earlier this month. U.S. Government Uniformed Services University of the Health Sciences/Getty Images hide caption

itoggle caption U.S. Government Uniformed Services University of the Health Sciences/Getty Images