It is not the E4B Doomsday plane, which I have seen more than a few times. It's at an altitude of about 4000 feet and constantly circling the base in a counter clockwise direction, completing a loop every 5-6 minutes.
trying to log into flight tracking and will link asap, if possible
Could be a "Dirt Box". A DRT collects cell phone data and they fly in patterns like this. For example.