The situation in Northeast Asia is inextricably linked to the U.S. Forces Korea(USFK). Although the USFK was established and survived due to the situation in Northeast Asia, the situation in Northeast Asia is now likely to maintain stability and peace due to the USFK. That can be seen from the fact that the USFK continues through the Cold War and the post-Cold War, despite repeated withdrawal decisions, reversal, and reduction. In particular, the fact that the USFK, the product of the Cold War, survives in the midst of the post-Cold War suggests that the USFK is adapting to the changing security environment, or the situation in Northeast Asia. The USFK has been establishing and institutionalizing its identity to suit the new security environment in critical junctions. It is clear that the change in the identity of the USFK and the possibility of institutionalization will play an important role in the future of the USFK and affect the situation in Northeast Asia. They say that if the role and function of the USFK are properly established and functioned in Northeast Asia, which is unstable amid the North Korean nuclear issue and the U.S.-China hegemony competition, it can contribute significantly to peace and stability in the region.