Unusual Collar Disk

[gardenscott]

Dug this today in a 20's area. I'm sure it's a collar disk but need help identifying it.
Thanks

 

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[ivan salis]

maybe Tennessee or texas --naval or national service ? -- national guard type thing ? the design is similar to W W1 --early W W 2 type disc

 

[NOLA_Ken]

It looks to be a Type 1 disk and will date 1910 - 1926. I don't know the abbreviation on it, never seen that one before. These weren't just used by the Army though, it could be a school ROTC type thing.