System High Corp.,* Chantilly, Virginia, has been awarded a $29,049,951 modification (P00007) to previously awarded contract HR001122C0073 for program security services. The modification brings the total cumulative face value of the contract to $56,355,171 from $27,305,220. Work will be performed in Arlington, Virginia, with an estimated completion date of March 2024. Fiscal 2023 research and development funds in the amount of $16,136,792 are being obligated at the time of award. The Defense Advanced Research Projects Agency, Arlington, Virginia, is the contracting activity.