Final answer:
The Chairman issues the Global Force Management Implementation Guidance with the approval of the Secretary of Defense.
Step-by-step explanation:
The Global Force Management Implementation Guidance is issued by the Chairman with the approval of the Secretary of Defense. The President, being the commander-in-chief of the nation's armed forces, is primarily responsible for conducting foreign affairs and has various roles such as appointing federal judges and heads of departments. However, in the context of the Global Force Management and operational oversight of the armed forces, it is the Secretary of Defense whom the Chairman of the Joint Chiefs of Staff would typically seek approval from for key guidance documents.