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If not a chief level, I would use red. For us, Fire Marshal has always been Division Chief level and therefore white.
I don't know if I'd call it typical, but here I am assigned a red helmet for essentially the same role as you described.
What is the typical helmet color for a Civilian Fire Marshal who is not a merit member of a department, nor at a chief level?
Looking for suggestions.
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Fire Inspectors Association of Indiana
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17437 Carey Road
Westfield, IN 46074