Bob Butler (left) and Bob Gordon paint crosses they placed in front of American flags at Central Christian Disciples of Christ church in the city of Killeen, Texas, which is home to Fort Hood. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

SPC Ivan Lopez is pictured in the Sinai Peninsula between 2007 and 2008 during his service with the 295th Infantry of the Puerto Rico National Guard in this undated handout photo. HANDOUT/Reuters/Landov hide caption

itoggle caption HANDOUT/Reuters/Landov

Sgt. First Class Erick Rodriguez stood guard at the entrance to Fort Hood as officials prepared to brief the news media about Wednesday's attack at the post. Erich Schlegel /Reuters/Landov hide caption

itoggle caption Erich Schlegel /Reuters/Landov

Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood, Texas. Reuters/Landov hide caption

itoggle caption Reuters/Landov