Airman 1st Class Alfredo Guzman, 509th Civil Engineer Squadron journeyman, assists Airman 1st Class Brandon Stone, 509th CES apprentice, with donning a FireHawk M7 mask at Whiteman Air Force Base, Mo., May 22, 2013. The mask is a self-contained breathing apparatus used to prevent any inhalations from chemicals or biological hazards. (U.S. Air Force photo by Airman 1st Class Keenan Berry/Released)
Airman 1st Class Keenan Berry
Taken on 22 May 2013
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