Firemen from the 3rd Civil Engineering Squadron, Elmendorf AFB, re-roll hoses after responding to a simulated fire during a Combat Employment Readiness Exercise. Crash crew personnel wear aluminized proximity gear to provide protection from high levels of radiant heat. Additionally members are in Mission-Oriented Protective Posture level four (MOPP 4). MOPP 4 provides the highest degree of chemical protection; personnel don the battledress overgarment, chemical protective footware covers, protective mask and hood, and NBC rubber gloves with cotten liners. The MCU-2/P Chemical-Biological Mask is used by ground crews