Aberdeen is one of 3 Army test facilities. The other 2 are in Yuma AZ and Dugway UT. there has ben an aerostat blimp over Yuma Proving Ground for the last 20 years. It is the precursor to the one in the article. No tinfoil need be harmed due to this story.
That doesn’t change the fact that Baltimore can NOT be trusted! :p
The Army has many more than three test facilities. For example, a lot of helicopter testing is done at Redstone Technical Test Center on Redstone Arsenal, AL. Then there is White Sands. There are others.
There’s a lot more than 3 Army test facilities.