What command relationship involves limited authority over forces necessary to accomplish assigned missions?

The command relationship that involves limited authority over forces necessary to accomplish assigned missions is Tactical Control. This command relationship allows a commander to direct the use of assigned or attached forces while retaining the authority to manage their operations and duties within a specified area.

Tactical Control is typically utilized in situations where forces need to perform specific tasks or missions but are still subject to the overall command and administrative authority of a higher command structure. This relationship is essential in ensuring forces are effectively coordinated in combat or operational settings while maintaining the flexibility required for tactical engagements.

In contrast, Operational Control encompasses broader responsibilities and authority, allowing a commander to plan and conduct operations across a larger scope, often involving multiple units. Administrative Control focuses on the logistics and administrative functions of forces rather than their operational deployment, and Strategic Control deals with broad, long-term objectives and resource allocation at a higher level of command. Consequently, Tactical Control is distinctly characterized by its focus on specific missions and immediate execution, making it the correct answer in this context.