In March 2006, Ministry of Defense and Japan Self Defense Forces (JSDF) shifted to the joint operational structure and Chief of Staff, Joint Staff was assigned to advise the Minister of Defense primarily from the viewpoint as a military specialist.
　In March 2025, JSDF Joint Operations Command (JJOC) was established to realize seamless cross-domain operations at all phases from peacetime to contingencies. Commander, JSDF Joint Operations Command (C-JJOC) takes centralized command of JSDF units from peacetime under the Defense Minister’s orders concerning JSDF operations. This enables seamless response to any situations even while they are transitioning.

Joint Operational Posture

　Self Defense Fleet integrates JMSDF subordinate units for operational matters from peacetime. Self Defense Fleet is in charge of centralized coordination on operations with Ground Component Command, Air Defense Command, Air Support Command, Space Operations Wing, and U.S. Navy from peacetime under the command of JJOC. This enables quick and smooth unit employment and coordination, contributing to enhanced effectiveness of joint operations.
　To become more advanced in joint operations, Self Defense Fleet actively takes part in joint exercises with JGSDF and JASDF. In particular, Self Defense Fleet is increasingly participating in joint exercises with JGSDF using JMSDF transport ships and overseas deployment missions.