Naval Operations Commander Vice Adm. Kim Myung-soo has been named the new chairman of the Joint Chiefs of Staff(JCS).

The government announced the appointment on Sunday in a major reshuffle of the top military brass, which simultaneously replaced all seven four-star generals with lieutenant generals in an extremely rare move.

It is the first time in ten years that a Navy officer has been appointed to the top military post since Adm. Choi Yoon-hee served as the JCS chairman from 2013 to 2015.

Kim’s appointment will be subject to a parliamentary confirmation hearing followed by approval in a Cabinet meeting Monday.

The major military personnel reshuffle came 17 months after the previous massive reshuffle in May of last year, right after the launch of the Yoon Suk Yeol government.