During which phase do landing forces, equipment, and supplies embark into assigned shipping?

The correct answer is embarkation. This phase is specifically focused on the process of loading forces, equipment, and supplies onto assigned shipping vessels. Embarkation is a critical step that takes place prior to deployment, as it ensures that all necessary assets are ready and secured for transport. Proper execution during this phase is essential for moving troops and materials effectively and efficiently to the desired operational area.

Rehearsal, while important, involves practicing the operations that will take place after embarkation; it does not involve loading supplies onto shipping. Action refers to the phase where forces are engaged in combat or operations, which occurs after embarkation has been completed. Movement involves the transit of forces to the operational area, but it assumes that the embarkation stage has already taken place. Therefore, embarkation is the precise phase where loading and preparation for transport actually occurs, making it the correct answer.