02 Apr

File:U.S. Air Force personnel with the 15th Operational Weather Squadron (OWS) receive instructions on proper procedures for checking the seal on their gas mask during a class on chemical warfare at Scott Air Force 080612-F-AV193-071.jpg

U.S. Air Force personnel with the 15th Operational Weather Squadron (OWS) receive instructions on proper procedures for checking the seal on their gas mask during a class on chemical warfare at Scott Air Force 080612-F-AV193-071.jpg

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http://commons.wikimedia.org/wiki/File:U.S._Air_Force_personnel_with_the_15th_Operational_Weather_Squadron_(OWS)_receive_instructions_on_proper_procedures_for_checking_the_seal_on_their_gas_mask_during_a_class_on_chemical_warfare_at_Scott_Air_Force_080612-F-AV193-071.jpg