U.S. Secretary of Defense Ashton Carter is due to unveil an updated cyber strategy that will stress the military's ability to retaliate with cyber weapons. The strategy presents a potentially far more muscular role for the U.S. military's cyber warriors than the Pentagon was willing to acknowledge in its last strategy rollout in 2011 and singles out threats from Russia, China, Iran and North Korea. "The U.S. must be able to declare or display effective response capabilities to deter an adversary from initiating an attack," according to the document.