U.S. forces, including naval forces, may be placed under the OPCON of what entity based on a Security Council resolution?

The correct answer is that U.S. forces, including naval forces, may be placed under the Operational Control (OPCON) of a UN commander based on a Security Council resolution. This arrangement typically occurs when the United Nations authorizes military operations through a resolution aimed at maintaining or restoring international peace and security. Under such circumstances, member nations may contribute forces to a UN-led operation, which necessitates placing those forces under a UN commander to ensure a unified command structure and adherence to the objectives outlined in the resolution.

This concept reflects the collaborative efforts of the international community to address conflicts and crises that exceed the capacity of individual nations to manage. Utilizing a UN commander ensures that the multinational force operates under a common mandate and rules of engagement, promoting coherence and effectiveness in executing the mission at hand.