Need Help With Collar Tabs?

[Fullstock]

A friend send me these pictures today. Her father recently passed away and these were in a box that belonged to him. They look like some kind of military collar disc, but I don’t recognize the design on them. Any ideas as to what they are and a time period? Thanks!

 

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[Deftone]

https://www.etsy.com/il-en/listing/581273129/vintage-fire-department-firemans-uniform

 

[Fullstock]

Thank you!!

 

[Deftone]

Fire Service Ranks and Organization Found some info on ranks.