Which command relationship allows the provision of support for a specific mission?

The command relationship that allows for the provision of support for a specific mission is task organizing. This method of organizing units involves assembling the necessary forces and resources to accomplish a particular mission or objective. It enables commanders to assign specific tasks to units tailored to the unique requirements of that mission. By leveraging task organizing, commanders can allocate troops, equipment, and support capabilities in a flexible manner to maximize effectiveness during an operation.

Task organizing is crucial because it facilitates adaptive and responsive operations; units can be reconfigured for the challenges presented by different missions, ensuring that the right capabilities are in place where and when they are needed most. The other options address different command relationships and do not provide the same level of flexibility in mission-specific support. For instance, organic refers to units that are inherently assigned to a higher unit, operational control allows for broader mission oversight but does not focus specifically on mission-based organization, and assign involves a permanent placement of units without the same adaptive structure that task organizing provides.