President Park Geun-hye has tapped current Defense Minister Kim Kwan-jin as her new top security adviser.
Referring to his four-year tenure as defense chief, the presidential office said Kim's field experience and years of policy-making will help him faithfully carry out his duties as the head of the National Security Office.
The former chairman of the Joint Chiefs of Staff, Han Min-koo , who is highly respected within the military, has been nominated to replace Kim.
The nomination comes ten days after both the president's top security adviser and the intelligence chief stepped down amid government reforms.
President Park is thought to have named a candidate for one of the two posts, amid rising concerns about a prolonged vacancy in the security control tower and continuous threats from North Korea.