From November of 2005, LTG(R) Chun served as the Director of US Affairs at the Korean Ministry of National Defense and was involved in negotiations and cooperation with the US on relocations of US forces, Camp returns, ROK/US Joint Vision Study, Special Measures Agreement and transition of Wartime Operational Control. He was selected for brigadier general on 3 November 2006. From November of 2006 to April of 2007, LTG(R) Chun was assigned to the First ROK Infantry Division as the Assistant Division Commander and concurrently assigned as a research fellow at the Center for International Studies/ Seoul National University. As of 1 May 2007, LTG(R) Chun was assigned as the Director of Operational Plans Development for the ROK Joint Chiefs of Staff. On 19 July 2007, 23 Korean missionary workers, including 16 women, were kidnapped by the Taliban. LTG(R) Chun was given seven hours’ notice to assemble a team and deploy to the International Security Assistance Force (ISAF) HQ in Kabul, Afghanistan and establish coordinating relations with ISAF and also to support the ROKG efforts for the release of the hostages. The incident lasted for forty four days and all but two were released unharmed. LTG(R) Chun was credited with accomplishing his mission successfully and was awarded the Korean Presidential citation. Upon completion of his duties as the Deputy-director for Strategic Planning at ROK JCS, LTG(R) Chun took over the OPCON Transition Group, which was charged with the responsibility of overseeing the transformation of wartime operational control from the US to the ROK. During his post he supervised establishment of the Initial Operational Capability of the ROK JCS and subordinate operational commands. LTG(R) Chun was promoted to two stars on 3 Nov of 2009 and took over command of the 27th Infantry Division. Under his leadership the unit gained a reputation to be “ Ready to Fight”. As of Nov 2011, LTG(R) Chun became the Deputy Assistant Chief of Staff, Operations for the ROK/US Combined Forces Command and Assistant Chief of Staff, Operations for Ground Component Command. In April on 2013, he became the Deputy Chief of Staff for CFC and the Senior Member of the United Nations Military Armistice Commission. In Nov of 2013, he was promoted to Lieutenant General and was assigned as the commander of the ROK Special Warfare Command. From April of 2015, he has been the Deputy Commander for the First ROK Army. LTG(R) Chun retired from active duty as of 31 July 2016.
After retirement LTG(R) Chun conducted concurrent fellowships with Brookings Institute and the US-Korea Institute, School of Advances International Studies (SAIS), Johns Hopkins University in Washington DC.
He is now a Distinguished Visiting Fellow with Georgia Tech at the Sam Nunn School of International Affairs in Atlanta. He is also Vice President for the Korea Freedom Federation. KFF is a sixty five year organization with three and a half million members.