CO A. Military Badge????

[curbdiggercarl57]

Dug this a few months ago out here in Denver.
Assuming the "CO" stands for Colorado, but the "A." eludes me.
Thinking Army, and the shape does remind me of a reunion type military item.
With the two holes on the bottom, I'm assuming it was part of a row of similar shaped items, or a badge of some sort.
The back is in bad shape, but could have had some sort of pin attachment.
I'm thinking Colorado Army, or possibly artillery, but that doesn't feel quite right.
Any help would be appreciated,
Carl

 

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[creskol]

I think you have part of a ladder badge/medal something like this one:

 

[curbdiggercarl57]

I think you have part of a ladder badge/medal something like this one:

Company A! I can't believe I didn't even think of that. Living in Colorado, I was only thinking of CO as such. Thank you, thank you!
Also couldn't remember the term "ladder badge" It's now etched in my brain. I'm assuming Post-Civil War?
Carl