Military button?

[Kat14]

His one is pretty bad looking. But I think there is the letter "I" that is raised on it. Anyone have any ideas?

Thank you in advance.

 

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[fat fred]

Hey there Kat! I'm pretty new at this myself. Can you show us the back and put it next to a coin for scale? I'm sure someone's gonna help you figure this one out. Best regards, Fred in Ga.