Final answer:
An Interservice Directive is a directive issued jointly by the Navy and one or more of the other military services.
Step-by-step explanation:
An Interservice Directive is a collaborative directive issued jointly by the Navy and one or more additional military services. This strategic document serves to synchronize and coordinate efforts among different branches of the military, fostering inter-service cooperation and ensuring a unified approach to specific objectives or operations. It embodies a shared commitment to seamless integration and joint decision-making, reflecting the combined expertise and capabilities of multiple armed forces. Such directives streamline communication, enhance interoperability, and contribute to the overall effectiveness of military endeavors by promoting a cohesive and synergistic approach to complex challenges faced by the armed services.