The U.S. Air Force awarded Science Applications International Corp. (SAIC) a prime contract to deliver deployable tactical air navigation (D-TACAN) systems to the Air Traffic Control and Landing Systems (ATCALS) program office at Tinker Air Force Base, OK. Work under the three-year contract, valued at more than $24 million, will be performed in San Diego. ATCALS utilizes a variety of systems, including D-TACAN, to provide bearing and distance of military aircraft to a ground or ship-borne air station. Under the contract, SAIC will deliver an estimated 19 D-TACAN systems, including transmitting, monitoring, antenna, distribution, status display and control subsystems, to replace the currently fielded TRN-26 series TACANs. Replacing these units will help the USAF achieve increased availability and reliability as well as a smaller logistical footprint. SAIC will work with the 558th ATCALS sustainment group at Tinker to deliver the new systems.