This handbook describes guidance for establishing the command relationship based on the joint force commander's concept of operations. It addresses formation, functions, and organization of the joint force land component commander. It also discusses the operational questions of who, what, when, and how of operations in support of major operations or campaigns by a joint force commander. It is not the intent of this handbook to supplant approved joint doctrine; nor is it the intent to restrict the authority of the joint force commander from organizing the force and executing the mission in a manner he deems most appropriate to ensure unity of effort in the accomplishment of the overall mission.