What type of command relationship is exemplified when a COMPO 3 (USAR) sustainment unit joins an organization for a rotational training exercise?

The situation described illustrates the concept of an "attached" command relationship. When a COMPO 3 (USAR) sustainment unit joins another organization for a rotational training exercise, it means that the unit is temporarily integrated into that organization to support its mission. In military terminology, an attachment involves placing a unit under the command of a different higher headquarters temporarily, allowing for operational effectiveness while maintaining its separate identity and responsibilities.

This command relationship is suited for instances like training exercises, as it provides flexibility and allows for cross-functional cooperation without permanently changing the unit's structure or chain of command. The sustainment unit retains its status while contributing to the mission of the host organization, fitting well with the intent of trainings where different units collaborate to achieve common operational goals.