found this US miliary button today metal detecting

[spwire]

HI can anyone tell me the year of this button and what branch it is the back is not readable any more .I found the button in Davenport Iowa close to Mississippi river. Can anyone help me thanks

 

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[Woodland Detectors]

General service Army button. I'd say WW2

 

[Eddie Lomax]

US Army Great Seal button used from 1902-present. You can't narrow it down much more without the backmark.