Bradley International Airport also has Guard units, both Air National Guard and Army National Guard. The ARNG has the 126th Aviation Regiment with its Chinooks and Blackhawks, while the ANG has the 118th Airlift Squadron’s C-21’s (a military version of a Learjet 35). That unit used to be 118th Fighter Squadron operating A-10 Warthogs until the last round of BRAC.
The Air National Guard actually bases many flying squadrons at joint military/civilian airports, making this kind of thing more common than you might imagine. A brief list of some notable civilian airports with Air Guard squadrons:
Nashville International Airport/105th Airlift Squadron (C-130)
Birmingham International Airport/108th Air Refueling Squadron (KC-135)
Minneapolis-St. Paul International Airport/109th Airlift Squadron (C-130)
Atlantic City International Airport/119th Fighter Squadron (F-16C)
Tulsa International Airport/125th Fighter Squadron (F-16C)
General Mitchell International Airport (Milwaukee)/126th Air Refueling Squadron (KC-135)
Portland (Maine) International Airport/132d Air Refueling Squadron (KC-135)
Pittsburgh International Airport/146th & 147th Air Refueling Squadrons (KC-135)
Tucson International Airport/148th &152nd Fighter Squadrons (F-16)
Memphis International Airport/155th Airlift Squadron (C-21)
Charlotte/Douglas International Airport/156th Airlift Squadron (C-130)
Jacksonville International Airport/159th Fighter Squadron (F-15C)
Sky Harbor International Airport/197th Air Refueling Squadron (KC-135)
Some of these are major hubs, like Charlotte/Douglas and Sky Harbor. Some ANG units flying from joint bases have unique capabilities. E.g.,Schenectady County Airport is home to the the only unit in the entire USAF flying ski-equipped LC-130’s.
I think it’s a travesty, though, that the unit based at General Mitchell doesn’t have any bombers.