A group of 319th Civil Engineering Squadron firefighters stand in a flashover simulator structure during a training exercise on Grand Forks Air Force Base, , Oct. 21, 2021. At the fully developed stage, the flashover simulator temperature ranges between 900 and 1,200 degrees Fahrenheit. ( Air Force photo by Airman 1st Class Ashley Richards)

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Photo credit: © APFootage / Alamy / Afripics
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