Gulfstream Private Jet with Mounted Weapons and Missile Pylons

This Gulfstream G-II briefly visited Cleveland, Ohio looking like a private jet with some crazy modifications on it including weapons pylons, missile pylons and some radar jammer - missile seeker equipment attached. The registration N105TB comes back to the government as an air force plane and also history at MIT. It's been photographed flying with the B-117 along with Mig aircraft at Groom Lake. Didn't stay long, just got fuel and left. The take off was loud and had a military jet sound to it at full power. The coolest civilian/military jet I've seen to date. Anyone know more about this plane? Comment and rate