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Explosive Ordnance Disposal (EOD) technician 3rd Class Aaron Ainley, left, assigned to EOD Mobile Unit (EODMU) 1, explains the functions of the DNS-300 underwater sonar system to Republic of Korea Navy UDT/SEALs during Exercise Clear Horizon 2015 on Commander Fleet Activities Chinhae. Exercise Clear Horizon is an annual bilateral exercise between the U.S. and Republic of Korea navies that focus on increasing capabilities and coordination between ships, and aircraft in mine countermeasures in international waters surrounding the Korean peninsula.