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1st Lt. Daniel Guerrero, 25th Fighter Wing Squadron A-10 Thunderbolt II pilot, stands with the A-10 static display at the Seoul International Aerospace and Defense Exhibition, also known as Seoul ADEX 21, Oct. 21, 2021. Seoul ADEX 21 is the largest, most comprehensive event of its kind in Northeast Asia, attracting aviation, aerospace professionals, key defense personnel, aviation enthusiasts and the general public alike. The A-10 was designed to provide close air support (CAS) to friendly ground troops by providing defense against enemy armored vehicles and tanks. The aircraft was activated in 1976 and is the only production-built model to serve in the USAF, solely designed for CAS. Its secondary mission is to provide forward air controller-airborne support by directing other aircraft in the air to engage with specific ground targets.