National Security: The commander in chief who once pined for a world without nuclear weapons has decided a world without an American deterrent is a good start, seeking to cut the U.S. arsenal by 80%. In a world where rogue states with unstable leadership are either in possession of or pursuing nuclear weapons, and with Russia rearming and China emerging as a world military and nuclear superpower, President Obama has ordered the Pentagon to consider cutting U.S. strategic nuclear forces to as few as 300 deployed warheads — below the number believed to be in China's arsenal and far fewer...