Courtesy of Air University Press. This essay is an abridged version of the article ‘Multi-Domain Operations – A Subtle but Significant Transition in Military Thought,’ published in The Air and Space Power Journal, Spring 2016. On 17 November 2011, Gen Martin Dempsey, chairman of the Joint Chiefs of Staff, asked the Military Education Coordination Council the prophetic question, ‘What’s after joint?’ After more than four years, that question remains ostensibly unanswered. The answer, however, may reside in the notion of...