L-3 Communications Integrated Systems L.P., doing business as L3 Aeromet, Tulsa, Oklahoma, is being awarded an indefinite-delivery/indefinite-quantity contract with a maximum amount of $172,719,699. A single initial task order in the amount of $22,878,503 is being issued. Under this contract, the contractor will provide support for the Airborne Sensors (ABS) program. These efforts will continue operations and sustainment of the High Altitude Observatory (HALO) aircraft and sensor equipment, mission planning and flight test execution, and improvement and modernization efforts. The work will be performed in Tulsa, Oklahoma. The ordering period will September 2021 through September 2026. One offeror was solicited and one offer was received. Fiscal 2021 research, development, test and evaluation funds in the amount of $5,000,000 are being obligated on this award. The Missile Defense Agency, Huntsville, Alabama, is the contracting activity (HQ0855-21-D-0001).