Leidos was awarded a prime contract by the Federal Aviation Administration (FAA) to replace the agency's Mode S Beacon Systems under the Mode S Beacon Replacement System (MSBRS) contract. The contract has a four-year base period of performance followed by four two-year option periods, at an approximate value of $450 million, if all options are exercised. Work will be performed in Gaithersburg, Md., Eagan, Minn., and Chesapeake, Va. The Mode S Beacon System is a secondary surveillance radar (beacon) capable of providing surveillance and specific aircraft information necessary to support Air Traffic Control (ATC) automation in all traffic environments. The FAA currently has 137 operational and 11 support Mode S radar systems across the National Airspace System (NAS). Under the MSBRS contract, Leidos, along with Thales, will perform program management, systems engineering, design and development, system test and evaluation, training, production, and site implementation. The modern Mode S beacon system will help the FAA increase operational availability and performance of the system, supporting common and consistent interface requirements, and providing a modern system that complies with current FAA Security Standards.