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A retired US Air Force colonel, Simpson is one of the founders of the Association of Air Force Missileers, a nationwide organization with more than 3,700 members. He has served as the group’s executive director, a volunteer position, since January 1993. During nearly three decades of military service, Simpson served in Titan I, Minuteman, and ground-launched cruise missile units and held many command positions, ending his career as chief of staff of the 57th Air Division at Minot Air Force Base in North Dakota.