I SURVIVED THE NIGHT.
Shortly after I posted the copter went back to Dobbins. If I had to guess some brass, or maybe just a pilot type, was doing flybys of their house, or perspective house.
HOWEVER, shortly after that a SIKORSKY UH-60 Black Hawk took off from Dobbins and practice touch and goes for an hour.

? Really? Is that a thing? Touch and Goes for a helicopter?
What's really fascinating to watch are when the USNavy Drones are on-station at 55,000' over the eastern Med. I wonder a) Why they turn on the ADS transponder at all, except as a warning to the bad guys who undoubtly are monitoring ADS-B, b) How many are out there without their transponder on?
FYI, most all the fighters & bombers are tagged by USAF as T-38s so you don't know what they really are. (Cargo and refueling planes have their real model numbers, usually.) However by watching their flight patterns you can sometimes discern what they are. A guy noticed a "T-38" light up on his nearby Air Base and he monitor the tower saying, "xxxx, hold for runway sweep" (That's involves 1 or 2 vehicles going down the runway and pick up any debris less it be sucked into the engines.) About the only plane still flying these days requiring a runway sweep is a B1-B. He quickly grabbed a camera and went to his favorite plane watching site. Sure enough about 20 minutes later he got a picture of a B1-B on takeoff.