A Republic of Korea Air Force F-16D Fighting Falcon refuels with a KC-135 Stratotanker from the 909th Air Refueling Squadron during a training exercise Oct. 8, 2019. The Department of Defense continues to strengthen the alliances and partnerships in the Indo-Pacific to a networked security architecture capable of deterring aggression, maintaining stability, and ensuring free access to common domains. With key countries in the region, such as the Republic of Korea, the bilateral and multilateral security relationships will come together to preserve a free and open Indo-Pacific. (U.S. Air Force photo by Senior Airman Cynthia Belío)