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While going through some old books in Kathy’s basement, I came across this card. Can anyone help me identify who this is? 

I cannot read the name on the left, but underneath it appears to say “Major General”. On the right side it may say “3rd Army ? and underneath possibly Army of (the) Potomac. 

Here is the reverse side of the card. I searched as much as I could using key words at different Official Brady sites but came up empty. Thanks.