File - In this May 13, 2009 file photo, sickened Iraq veteran Larry Roberta looks down during his testimony before the House Rules Committee at the Oregon Capitol in Salem, Ore., about his exposure to... more 
File - In this May 13, 2009 file photo, sickened Iraq veteran Larry Roberta looks down during his testimony before the House Rules Committee at the Oregon Capitol in Salem, Ore., about his exposure to a chemical called sodium dichromate, which contains a potentially cancer-causing substance. A military contractor knew an Iraqi water treatment plant's lax environmental standards let a toxic chemical contaminate the area, but never disclosed it to Oregon National Guard soldiers who were sickened, the soldiers said in a complaint filed Wednesday, April 4, 2012. The complaint in U.S. District Court in Oregon alleges Kellogg, Brown and Root knew about the presence of sodium dichromate at the Qarmat Ali water treatment plant months before the date they originally gave in testimony and depositions. (AP Photo/Rick Bowmer, File) less 
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Associated Press | Photo By Rick Bowmer, File
Wed, Apr 4, 2012 3:57 PM EDT