National Aerospace Solutions LLC, Arnold Air Force Base, Tennessee, has been awarded a $442,227,417 modification (P00241) to previously awarded contract FA9101-15-C-0500 for test operations and sustainment. The contract modification is for test operations, technology development, equipment and facility sustainment, capital improvements, and some support services for Arnold Engineering Development Complex. The proposed action will extend contract FA9101-15-C-0500 for up to one year (if all options are exercised). The location of performance is Arnold Air Force Base, Tennessee. The work is expected to be completed by June 30, 2025. Total cumulative face value of the contract is $2,616,438,223. No funds are being obligated at the time of award. The Air Force Test Center, Arnold Air Force Base, Tennessee, is the contracting activity.