What is the title of the Secretary of the Navy mentioned in the text?

The title of the Secretary of the Navy is indeed "The Honorable Richard Spencer." This designation reflects the formal respect afforded to individuals serving in high governmental positions. The Secretary of the Navy is responsible for the naval forces, overseeing the Department of the Navy, which includes the U.S. Navy and the U.S. Marine Corps.

While James Mattis, Donald J. Trump, and Mike Pence have held significant roles in the U.S. government, such as Secretary of Defense and President respectively, they do not hold the position of Secretary of the Navy. This distinction makes Richard Spencer the correct answer to this question, as he directly fulfills the duties associated with that role as it pertains to the organization and administration of the Navy and Marine Corps.