Warfare Executive Committee, dated March 17, 2015. (g) Co-chairs of Executive Committee (1) In general The Under Secretary of Defense for Acquisition and Sustainment and the Vice Chairman of the Joint Chiefs of Staff, or their designees, shall serve as co-chairs of the Executive Committee. (2) Responsibilities of co-chairs The co-chairs of the Executive Committee shall— (A) preside at all Executive Committee meetings or have their designees preside at such meetings