Final answer:
The National Military Strategy is signed by the Chairman of the Joint Chiefs of Staff, who is the top uniformed military officer and key military advisor.
Step-by-step explanation:
The National Military Strategy (NMS) is signed by the Chairman of the Joint Chiefs of Staff. This document outlines the strategy for how the armed forces can support national objectives. The Chairman serves as a key military advisor to the President, the National Security Council, and the Secretary of Defense. While the President is the Commander-in-Chief of the United States armed forces, the role of signing the NMS specifically falls within the purview of the Chairman of the Joint Chiefs of Staff, who is the top uniformed military officer in the country.