Northrop Grumman Systems Corp. (NGSC), Chandler, Arizona, is being awarded a $10,542,244 modification to a previously awarded contract (HQ0147-19-C-0005) to exercise a Static Fire Castor IV-B test. The value of this contract is increased from $343,945,282 to $354,487,526. Under this modification, the contractor will perform pre-test analysis to predict standard motor performance parameters such as pressures, temperatures, thrust, and thrust vector control. NGSC will also design and fabricate the test tooling, incorporate instrumentation, conduct a test readiness review, conduct the test, and provide a final report detailing the motor performance. The motor used will be a Castor IV-B rocket motor, which is owned and produced by Northrop Grumman. The work will be performed in Chandler, Arizona; and Promontory, Utah. The performance period is from November 2022 through February 2024. Fiscal 2023 research, development, test and evaluations funds will be used on this effort; however, no funds are being obligated at this time. A sources sought notification was posted on SAM.gov and only one response was received. The Missile Defense Agency, Redstone Arsenal, Alabama, is the contracting activity.