During which phase of projection are forces and material transferred to support another joint force commander's operational requirements?

The deployment phase is characterized by the transfer of forces and materials to support the operational requirements set forth by a joint force commander. This phase is crucial in establishing a strong and effective operational posture by ensuring that the right resources, personnel, and equipment are in place to meet the needs of the mission.

During deployment, units and supplies are mobilized and moved from their home stations or bases to the areas of operation. This phase often involves logistics coordination, transportation arrangements, and ensuring that all necessary resources are available and ready for the joint force's use. The successful execution of the deployment phase ensures that forces are able to quickly and efficiently establish operational capabilities and achieve their designated objectives.

The other phases—employment, redeployment, and planning—serve different purposes. The employment phase focuses on the actual execution of operations once forces are in place, the redeployment phase deals with returning forces and materials back to their original locations post-operation, and the planning phase is concerned with strategizing and preparing for future operations. Each of these phases is important but does not specifically address the transfer of forces and materials to meet operational requirements, which is the core function of the deployment phase.