국가재건최고회의
Chun, then a captain, led a demonstration at the KMA to show support for the May 16 coup led by Park Chung-hee. Chun was subsequently made secretary to the commander of the Supreme Council for National Reconstruction, placing him directly under Park. Chun was quickly promoted to major in 1962, while continuing to make powerful friends and acquaintances. As a major, Chun was the deputy chief of operations for the Special Warfare Command's battle headquarters, and later worked for the Supreme Council for Reconstruction again as the Chief Civil Affairs Officer. In 1963, Chun was given a position in the Korean Central Intelligence Agency (KCIA) as Personnel Director. By 1969, he was senior advisor to the Army Chief of Staff.