Help needed to identify button

[Drewha72]

This button was dug in Carlisle, PA in an area where I have found several Civil War items. The top of the button has an eagle holding arrows, the middle has the letters "U S" and at the bottom is a chain circle.
The back is marked "United States". Any help would be appreciated. Thanks.

 

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[TheCannonballGuy]

Your button is a US Army "Great-Coat" button. It was manufactured from 1820 to 1839.

 

[Drewha72]

Thanks for the quick reply CannonballGuy. The button is easy to find when you know what to call it.