Staff Sgt. Shirley Woods decontaminates Tech. Sgt. Lee Dresch in the decontamination line during a Hazardous Waste Operations and Emergency Response (HAZWOPER) class at the 120th Airlift Wing in Great Falls Mont. May 20, 2016. The 120th AW offers an annual 40 hour course and an 8 hour refresher course annually. (U.S. Air National Guard photo/Senior Master Sgt. Eric Peterson)