Air Force 1st Lt. Ben Otterbein, a pilot from the 193rd Special Operations Squadron, wears an Aircrew Eye Respiratory Protection system while flying Dec. 2, 2017, at 193rd Special Operations Wing, Middletown, Pennsylvania. Otterbein and other the 193rd SOS aircrew completed an in-flight training exercise while wearing the AERP protective equipment, simulating how the aircrew would have to operate in a Chemical, Biological, Radiological and Nuclear defense scenario. ( Air National Guard

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