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U.S. Soldiers prepare to enter a building during a simulated chemical attack

United States soldiers with the 44th Chemical Company, 2nd Chemical Battalion, 48th Chemical Brigade, based at Fort Hood, Texas, prepare to enter and clear a building of opposing forces during a simulated chemical attack at Fort McCoy, Wisconsin, on May 12, 2014. Soldiers with the 44th Chemical Company were participating in an annual combat support training exercise involving 7,000 soldiers and joint military personnel. U.S. Army photo by Spc. Robert Farrell, released. (This image was released by the United States Army with the ID 140512-A-TW638-080. This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.)