To avoid adverse effect on operations, commanders should address all sovereignty issues through the chain of command to the US?

The correct choice revolves around the appropriate channels for addressing sovereignty issues in military operations. In this context, an ambassador typically serves as the primary representative of the U.S. government in a foreign country. They play a crucial role in diplomatic relations and can effectively handle matters related to sovereignty that may affect military operations.

When issues arise that could potentially impact U.S. military actions or relations with host nations, it is vital for commanders to communicate with the ambassador who can liaise with the local government and other relevant stakeholders. This approach helps to ensure that military operations align with diplomatic efforts, and sovereignty issues are managed effectively, thus avoiding adverse effects on operations.

While the President, Secretary of Defense, and Joint Chiefs of Staff are undeniably important in the chain of command and decision-making processes at a strategic level, they are often not directly involved in the day-to-day operational sovereignty issues that an ambassador is specifically trained and positioned to address.