sentences:  Although Casey hoped he would be back in TIV 2 before the end of the season, repairs and modifications on TIV 2 took longer than expected and Casey was shown on "Storm Chasers" ending the season in the original TIV.In the fall of 2008, TIV 2 received several modifications, mostly focused on reducing the vehicle's weight.To achieve this, certain less crucial areas of TIV 2's armor were converted from steel to aluminum while more vital areas were reinforced with supplemental composite armor consisting of thin layers of steel, Kevlar, polycarbonate, and rubber.