What discipline ensures that services complement each other's efforts?

The correct answer, Joint Interdependence, refers to the coordinated efforts and mutual reliance among the services to achieve overall objectives in a joint environment. This discipline emphasizes that each service has unique capabilities and strengths that, when effectively integrated, enhance operational effectiveness and mission success. Joint Interdependence is critical for ensuring that while each service executes its own strategies and tactics, they also support and enhance the actions of other services, leading to a more cohesive and effective military force.

In contrast, the other choices do not fully encapsulate this kind of collaborative focus. Joint Training primarily outlines the framework for preparing services to operate together but does not inherently assure that their efforts complement each other. Inter-Service Cooperation typically describes relationships and actions taken between services, rather than the synthesis of their strengths in a complementing fashion. Mission Integration pertains to aligning various missions and tasks, yet it may not specifically address the interdependencies that exist among the different military branches. Therefore, Joint Interdependence is the term that most accurately reflects the discipline focused on the synergistic efforts of the armed services.