Two military jets chasing illumnated object over Wisconsin

I live on a dead end private lake road.  Across the road, from my cottage, is a well treed woods .  My brother came over to talk about mothers estate after I had gotten out of work late .  After talking for a few hours , I walked my brother out to his car parked in my driveway .  The conversation continued out at the driveway for a while and was interrupted by the sound of a jet.  My brother, whom knows more about aircraft than I do, said it sounded more like two jets and that they were military.  I moved back towards the cottage to get a better field of view and witnessed an illuminated object being chased by two military jets . I called my brother over to the spot in witch I was at to see what I was seeing .  When he got there he thought that the jets were F-16s , and that they had their after burners on.  The object was elevating and taking a zig zag pattern.  Every time the object would make a radius turn , the jets would take an intercept angle .  The object seemed to be a bit faster than the jets and seemed to me that it was checking their capabilities.  After three or four turns , my brother , told me that the jets were at their max ceiling and that they would have to stop elevating .  About twenty to thirty seconds later , the two jets , turned off their after burners and turned 180 degrees as we watched the illuminated object fly straight out of the atmosphere and disappear into the stars.  From what I could tell , the craft was disk shaped and illuminated , and from what my brother and I could tell , it was about twice the size of one jet .  We also could not tell exactly how far from us this had occurred, it could have been two miles or several.
Source of report indicates that the date of the incident is approximate.  PD