When the Soldiers and Airmen of the Wisconsin National Guard’s 54th Civil Support Team arrived in Milwaukee last week, they faced an unknown hazardous materials threat in a vacant school building on the city’s northwest side.Representatives from the FBI, the Milwaukee Police Department’s Hazardous Device Unit, or “bomb squad,” and the Milwaukee Fire Department’s Hazardous Materials Team were already on-hand, as were representatives of the Environmental Protection Agency and local public health officials. The bomb squad and the hazmat team had already entered the building with robots and quickly determined that a potential weapons of mass destruction threat existed inside the building, and the CST was called in to assist.