Airman 1st Class Dezmond Ross, 100th Maintenance Squadron fuel systems repair apprentice, tests the concentration of fuel vapor in the air using a photoionization detector at RAF Mildenhall, England, May 27, 2020. Fuel systems repair Airmen use the PID to determine if fuel vapor concentrations are low enough to safely perform maintenance. (U.S. Air Force photo by Airman 1st Class Joseph Barron)

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Photo by: Airman 1st Class Joseph Barron |  VIRIN: 200527-F-PZ401-1144.JPG