09 November 2015 U.S., ROK Navies to Conduct Mine Countermeasures Exercise CHINHAE, Republic of Korea -- The U.S. and Republic of Korea (ROK) navies will participate in Exercise Clear Horizon, Nov. 9-13, in waters south of the Korean Peninsula.Clear Horizon is an annual bilateral exercise between the U.S. and ROK navies designed to enhance cooperation and improve...