Sentinel System is the next generation ICBM under development. A megaproject equivalent to 15 Defense Department programs in scope, design, development, certification and deployment, it will recapitalize or modernize 400 missiles, 450 silos and more than 600 facilities across almost 40,000 square miles of US territory, over 6 states, 3 operational wings and a test location. (U.S. Air Force video By Staff Sgt. Franklin Harris) More