Friday Funny/Grandfather's Regiment

Last night I ran a search on Ancestry for the military records of my great-great-grandfather William H. Wiggins.  This is what I found:

    

     Admittedly, grandfather's handwriting was atrocious; however, I could make out the G for company G followed by 9th NY Heavy Arty.  Ancestry didn't see it that way, this is their interpretation:

     
    Just look at Grandfather's regiment! And he was retired, not rehired, good grief.