Final answer:
The Command Master Chief is a senior enlisted advisor at a command level, the Chief of Naval Research oversees research for naval enhancement, the Commander of Naval Special Warfare is in charge of Navy special operations forces, and the Senior enlisted advisor to the Secretary of Defense provides counsel on enlisted personnel affairs.
Step-by-step explanation:
The roles and responsibilities in the chain of command for the positions you've mentioned vary in scope and authority.
Command Master Chief is the top enlisted leader in a Navy command, acting as the senior enlisted advisor to the commanding officer and as an advocate for the enlisted crew. In a similar vein, the Chief of Naval Research oversees scientific research efforts to enhance the capabilities of the Navy and Marine Corps, while the Commander of Naval Special Warfare commands the Special Warfare units of the Navy, such as SEAL teams, and is responsible for their readiness, training, and operations.
Lastly, the Senior enlisted advisor to the Secretary of Defense serves as the principal enlisted advisor, providing the Secretary with advice on matters concerning the enlisted personnel across all branches of the military.