High expansion foam begins to fill the newly renovated fuel cell hangar as part of a fire suppression system test at Duke Field, Florida, Dec. 2, 2020. The system test is one of the last steps towards the hangar renovation completion. (U.S. Air Force photo by Senior Airman Dylan Gentile)

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Photo by: Senior Airman Dylan M. Gentile |  VIRIN: 201201-F-XG228-1602.JPG