Thanks for your prompt response and assistance. Alphabetical "Coberly" hits from www.civilwar.nps.gov/cwss/ under "cavalry" are:

No. Soldier Name Side Function Regiment Name
1
Coberly, Asby M.
Confederate
Cavalry
19th Regiment, Virginia Cavalry

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2
Coberly, B.W.
Confederate
Cavalry
19th Regiment, Virginia Cavalry

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3
Coberly, Felix
Union
Cavalry
3rd Regiment, Iowa Cavalry

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4
Coberly, Jesse
Union
Cavalry
6th Regiment, Missouri State Militia Cavalry

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5
Coberly, John R.
Union
Cavalry
12th Regiment, Missouri Cavalry

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6
Coberly, Joseph G.
Union
Cavalry
3rd Regiment, Colorado Cavalry

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7
Coberly, Oliver
Union
Cavalry
6th Regiment, Kansas Cavalry

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I wasn't able to find individual muster out dates, but unit muster out dates are all after 12/31/64. I'm hoping the serial number will lead us to one of these regiments. Again, thanks for your help, Paul