What is the command authority established by a superior commander between subordinate commanders when one organization should aid protect complement or sustain another force called?

The command authority established by a superior commander to ensure that one organization aids, protects, complements, or sustains another force is known as "tactical control" (TACON). This authority allows subordinate commanders to coordinate their actions and resources effectively, ensuring operational efficiency and mission success. It enables seamless collaboration among forces while maintaining the overall command structure.