North Korea’s Korean People’s Army conducted a “night naval fire strike drill” attended by Kim Jong Un, the Korean Central News Agency (KCNA) reported Tuesday.

Artillery units from the KPA 10th Corps and vessels from the KPA Navy’s East Sea Fleet participated in the joint drill somewhere in the 10th Corps area near Wonsan, on the country’s East Coast. Such joint service drills help to test and improve the ability of KPA units of different types and from different commands to coordinate in a single military operation.