U.S. Air Force Fact Sheet AFRL/RZK (PROPULSION CONTRACTING DIVISION) AFRL/RZK (Propulsion Contracting Division) Phone: (937) 255-5499      DSN: (785) Provides contracting expertise to the directorate. Responsible for developing advanced acquisition plans, determining proper authorities under the law; selecting sources; coordinating and evaluating proposals; pricing, negotiating and writing contracts; issuing and administering purchase and delivery orders; administering obligation authorities; and closing out contracts. Provides guidance and advice to the Director on all aspects of contracting.