A building on Fort Hood Army Base in Fort Hood, Texas, is seen in this 2014 photo. Rescue crews were searching for four soldiers missing after a training accident on Thursday. Joe Raedle/Getty Images hide caption

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An American soldier (right) from the First Armored "Ironhorse" Brigade of the 1st Calvary Division is among those who began arriving in South Korea in mid-January. They are replacing U.S. troops that cycle out in February. He's speaking with a South Korean soldier who's part of an integrated U.S.-South Korean division. Elise Hu/NPR hide caption

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Welcome To Korea: 4,000 U.S. Troops Arrive At A Tense Time

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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

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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

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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

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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

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Court-Martial To Begin Tuesday In Fort Hood Shooting Rampage

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