Major Hamilton examines the nature and degree of the convergence of the United States Army and Air Force airpower thinking and doctrine since the Vietnam War. His study is concerned with airpower and does not incorporate theories or doctrine that deal with the space medium. He excludes Navy and Marine airpower theories. Major Hamilton discusses thinking on airpower in Vietnam, Army airpower thinking from 1972 to 1992, and the USAF thinking on airpower from that same time frame. He concludes that the Army and Air Force have a long track record of cooperation, and that areas of conceptual agreement exist from which to build a comprehensive theory of airpower.