Institute for Defense Analyses (IDA), Alexandria, Virginia, is awarded a $180,000,000 modification (P00005) to increase the ceiling on a cost-plus-fixed-fee contract (HQ003419D0001) from $950,668,589 to $1,130,668,589. No funds are being obligated at the time of the ceiling increase. The cumulative total of the contract is $1,130,668,589. The total if all options are exercised is $1,130,668,589. The purpose of this contract is to 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 the defense agencies. This work will involve the comprehensive evaluation of national security issues, including systems and technologies at all stages of development, deployment, and use. This research will require a deep understanding of performance, mission capabilities and costs, the underlying technologies, the information environment, the supporting infrastructure, and related intelligence matters. It also will require a thorough knowledge of the national security policies, strategies, organizational structures and relationships, and force employment concepts that help determine which capabilities are needed and how they will be used. The work will be performed at IDA Headquarters, Alexandria, Virginia. The estimated completion date is June 30, 2024. Washington Headquarters Services, Arlington, Virginia, is the contracting activity.