The Ticonderoga Class ship was first conceived as a low cost, large production number vessel with a hull based on the Spruance Class Destroyer but later was redesigned as a cruiser. Over time the Ticonderoga Class evolved in to one of the most advanced ships in the USN inventory. The Ticonderoga Class was the first combat surface ship to be equipped with the AEGIS Weapon System that can detect threats 200 miles away and provide defense against the threat. Originally there were 27 ships built but 5 have been retired.