'Problems of U.S. nuclear forces must be addressed; W.H. 'gang of five'; McCain's defense; No 'Cold War' on cyber

U.S. strategic nuclear forces, both weapons and personnel, are experiencing serious problems that must be addressed urgently. That is a central conclusion of a new study called the "Nuclear Enterprise Review" that the Pentagon is expected to release next week, according to defense officials familiar with the study. Fixing nuclear forces' problems will require the investment…