Applied Research Associates Inc., Alexandria, Virginia, is awarded a modification (P00007) to increase the ceiling on a hybrid indefinite-delivery, indefinite-quantity contract (HQ003421D0004) by $420,000,000, from $496,000,000 to $916,000,000, to provide a range of technical and engineering services required to assist the Office of the Under Secretary of Defense for Research and Engineering. The technical and engineering services will include modeling and simulation, operations research, mission engineering, development test and evaluation, prototyping, experimentation, and demonstration, science and technology research and assessment, and data management analysis. As of today, the types of contracts awarded include firm-fixed-price, firm-fixed-price level-of-effort, and cost contracts. No funds are being obligated at the time of the ceiling increase. The total if all options are exercised is $916,000,000. Work will be performed at the contractor facility in Alexandria, Virginia, and at government facilities in Falls Church, Virginia; and Alexandria, Virginia. The estimated completion date is Nov. 19, 2025. Washington Headquarters Services, Arlington, Virginia, is the contracting activity.