The Boeing Co. has been awarded a modified contract from the U.S. Air Force for sustainment of the space-based space surveillance Block 10 satellite. The deal, announced Wednesday by the Department of Defense and worth more than $21.9 million under the terms of the contract, is classified as a cost-plus-incentive-fee and cost-plus-fixed-fee contract. The Space Based Space Surveillance, or SBSS, Block 10 satellite operates 24-hours a day, 7-days a week with a clear and unobstructed view of objects orbiting Earth. The SBSS is used to "collect metric and Space Object Identification data for man-made orbiting objects without the disruption of weather, time of day and atmosphere that can limit ground-based systems." Work on the contract will be performed in California and Colorado, and is expected to be completed by June 2022.