The proliferation of weapons of mass destruction, the globalization of technology and manufacturing, asymmetric warfare advances and the possibility of unwise decision-making -- all these factors, and many more, are the subject of a sweeping new study of future scenarios that could mitigate U.S. military power and even threaten the existence of the United States, according to the Defense Department. Pentagon acquisition chief Kenneth Krieg, in a Feb. 2 memorandum to the chairman of the Defense Science Board, paints a...