Within DoD, senior authorities responsible for the planning and oversight of the DoD S&T program. S&T Executives include the Assistant Secretary of Defense (Research and Engineering) (ASD(R&E)), who is also the Chief Technology Officer (CTO) of DoD, the Deputy Assistant Secretary of the Army for Research and Technology (DASA(R&T)), who also is the Army's Chief Scientist, the Chief of Naval Research, who is also the Assistant Deputy Commandant of the Marine Corps for Science and Technology, and the Deputy Assistant Secretary of the Air Force for Science, Technology and Engineering.