The accelerating rate of technological advancement will drive a fundamental change in how the Army organizes, resources and conducts operations on its installations. For over two centuries, the Army has relied principally on geography to protect its bases from foreign powers. Unpredictable global politics and the diffused application of abundant technology are shrinking our natural defenses with unprecedented velocity. America’s military culture, forged from a history that confronts threats abroad, should recognize that distance no longer offers safety and that new concepts and doctrine are needed to prepare installations for the future that is, in many ways, already here.