An investigation into what sickened 11 soldiers who ingested an unauthorized substance shows they drank an industrial compound found in antifreeze believing it was alcohol following a 10-day field training exercise at Fort Bliss in Texas, U.S. Army officials said Friday. Lt. Col. Allie Payne, public affairs officer for the 1st Armored Division and Fort Bliss, said in a press conference that initial laboratory reports indicate the soldiers consumed ethylene glycol, commonly found automotive products including engine coolant and brake fluid. The 11 soldiers—including two who were in serious condition—were being treated at William Beaumont Army Medical Center in the border city of El Paso, where they have been since Thursday afternoon, Fort Bliss said. Two soldiers had needed critical care, but their conditions were upgraded. One of the soldiers had to be intubated but no longer needs breathing assistance, Payne said. Up to four soldiers were expected to be …