Field Aerospace (Field) has completed the Turkish Air Force KC-135 Block 45 modification, under a contract through the KC-135 Foreign Military Sales (FMS) program Office on 30th January, 2023. The program finished one year ahead of schedule.   

Türkiye is the second largest operator of the KC-135 Stratotanker next to the USAF. The Block 45 modification removes the legacy autopilot system, Flight Director System, engine analog gages, and radio altimeter and installs a Dual Autopilot and Flight Director System, new radio altimeter system, and new engine display. This effort included modifications to seven Turkish Air Force KC-135 Block 45 Aircraft. This contract period of performance was from January 29, 2021, to January 28, 2024. Work was completed in December of 2022.