William Dunn, a contractor, checks the connection points of a decontamination duct on a C-130 Hercules July 6, 2011, at Little Rock Air Force Base, Ark. The decontamination duct supplies hot, humid air to the aircraft to determine how heat and humidity affect the decontamination process for an aircraft contaminated with a simulated biological agent. (U.S. Air Force photo/Airman 1st Class Rusty Frank)