"As I discovered in my command and control research in the late fifties, President Eisenhower had secretly delegated authority to initiate nuclear attacks to his theater commanders under various circumstances, including the outage of communications with Washington (a daily occurrence in the Pacific) or a presidential incapacitation (which Eisenhower suffered twice). And with his authorization, they had in turn delegated this initiative, under comparable crisis conditions, to subordinate commanders. To my surprise, after I had alerted the Kennedy White House to this policy and its dangers, President Kennedy continued it (rather than reverse the decision of the “great commander” who had preceded him). So did Presidents Johnson, Nixon, and Carter. So, almost certainly, has every subsequent president to this day, even though in the past several decades there may have been at least nominal “devolution” to some civilian outside Washington. This delegation has been one of our highest national secrets."