Who serves as the Secretary of War?

The position of Secretary of War was historically a key role in the United States government, responsible for managing the nation's military forces and overseeing military policies. However, this title was changed to Secretary of Defense in 1947 with the establishment of the Department of Defense, thus making the role of Secretary of War obsolete.

Currently, the Secretary of Defense is responsible for overseeing national defense in the United States, and this position is held by Lloyd Austin. In your provided choices, the correct answer involves understanding the structure and terminology of current U.S. government positions. Given that the role of Secretary of War is no longer in existence, the choice indicating Lloyd Austin as the Secretary of Defense aligns with contemporary government structure.

Therefore, the correct answer should reference the current title and role responsible for military matters, which would be Lloyd Austin, the Secretary of Defense.