Master Sgt. Jeffrey Redline (right) of the 193rd Special Operations Wing's Bioenvironmental Shop, Pennsylvania Air National Guard located at the Harrisburg International Airport Middletown, Pa., prepares to test a supposed contaminating powder as Robert Kline (left), a Civilian contractor, aids during a Bio-environmental Exercise held Jan. 4, 2008. The 193rd Civil Engineer Squadron held the preparedness exercise to have the Bioenvironmental Office and the Fire Crash Station work together to be proficient in handling of hazardous materials. Redline is simulating having a gas mask on. (Released) (US Air Force photo by Tech. Sgt. Matt D. Schwartz)