Northrop Grumman Systems Corp., Oklahoma City, Oklahoma, has been awarded a minimum $8,561,587 modification (P00006) to a four-year base contract (SPRTA1-19-D-0001) with one five-year option period to add pricing for the manufacture of B-2 mid liner exhaust pipes. This is a firm-fixed-price, indefinite-quantity contract. Location of performance is California, with a June 1, 2024, performance completion date. Using military service is Air Force. Type of appropriation is fiscal 2022 defense working capital funds. The contracting activity is the Defense Logistics Agency Aviation, Tinker Air Force Base, Oklahoma.