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

toggle caption Reuters /Landov

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

toggle caption HANDOUT/Reuters/Landov