Institute for Defense Analyses, Alexandria, Virginia (HQ003424D0020), is awarded a cost-plus-fixed-fee contract valued at $1,424,039,026. No funds are being obligated at time of award. The total, if all options are exercised, is $1,424,039,026. The Institute for Defense Analyses will provide research, analyses, technical evaluation, and test and evaluation support to the Office of the Secretary of Defense, the Joint Staff, the combatant commands, and defense agencies. This requirement will maintain the comprehensive evaluation of national security issues, including systems and technologies at all stages of development, deployment, and use. The tasking and future obligations will be issued via task orders and task order modifications. This notification covers all work to be awarded up to the ceiling amount of the indefinite delivery-indefinite quantity contract. The work will be performed in Alexandria, Virginia. The estimated contract completion date is June 30, 2029. Washington Headquarters Services, Arlington, Virginia, is the contracting activity.