A soldier walks past a flag at half staff before a memorial service at Fort Hood on April 9, 2014 in Texas. Brendan Smialowski/AFP/Getty Images hide caption
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A memorial for Staff Sgt. Carlos Lazaney Rodriguez is seen before a service at Fort Hood on Wednesday. Brendan Smialowski/AFP/Getty Images hide caption
Obama Speaks At Fort Hood
U.S. 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 an undated handout photo by PR National Guard. Lopez killed three other soldiers and himself at Fort Hood, Texas, this week, officials say. Reuters /Landov hide caption
U.S. 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 an undated handout photo by PR National Guard. Lopez killed three other soldiers and himself at Fort Hood, Texas, this week, officials say. Reuters /Landov hide caption
Dinora Lopez Miranda, 87, grandmother of U.S. Army soldier Iván López, holds a picture of her grandchildren, Eliezer (from left), Ivanis, Ivan and Rickey, while speaking to journalists outside her home in Guayanilla, Puerto Rico. Ana Martinez/Reuters/Landov hide caption
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
Bob Butler (left) and Bob Gordon work on a memorial Thursday at Central Christian Church in Killeen, Texas, for the victims of the Fort Hood shooting. Eric Gay/AP hide caption
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
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
Lucy Hamlin and her husband, Spc. Timothy Hamlin, wait for permission to re-enter the Fort Hood military post, following a shooting there Wednesday. Tamir Kalifa/AP hide caption
Nidal Hasan, seen here in 2010, has been sentenced to death for killing 13 people and wounding more than 30 more in a shooting rampage at Fort Hood, Texas, in 2009. Bell County Sheriff's Office handout/Getty Images hide caption
Maj. Nidal Hasan faces 13 counts of premeditated murder and 32 counts of attempted murder for the November 2009 shootings at Fort Hood, Texas. Bell County Sheriff's Office/Reuters/Landov hide caption
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
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
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
This undated handout photo provided by the Bell County Sheriff's Department shows US Army Maj. Nidal Hasan AFP/Getty Images hide caption