Airman 1st Class Jennifer Hansen, 55th Aerospace Medicine Squadron bioenvironmental, performs a gas mask fit test on Capt. Joe Prohaska, 338th Combat Training Squadron, Thursday, Oct. 26 in Farichild Hall on Offutt Air Force Base, Neb. Hansen will walk Prohaska through a series of steps to include shaking his head up and down and side to side to ensure the seal is tight. ( Air Force photo by Tech. Sgt. Rachelle Blake)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 55th, aerospace, afb, bioenvironmental, gas, mask, medicine, offutt, squadron