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Secretary of the Navy
No, you are not. The Navy and the Marines are two separate services. But the Marines are a part of the Navy. Some Navy personnel are assigned to the Marine Corps, such as Corpsman.
Sec-Nav
The Marine Corps has always been under the Department of the Navy, from its beginning until today. The Navy and Marine Corps are 2 separate entities within the Department of the Navy, and each have their own senior Commander who oversees each branch. For the Navy, it's the Chief of Naval Operations, the Marines it's the Commandant of the Marine Corps. Both officers report directly to the Secretary of the Navy, who in turn reports to the Secretary of Defense, and then the President.
The current Commandant is General James F. Amos since 2010.
A few of the many are: Marine Ethology, Coral Taxonomy, Micro Biology, Marine Mammology, Icthyology, Fisheries and Aquaculture, Deep Sea ecology, Marine Herpetology, Marine Ornithology, Marine Invertebrate zoology.
Two separate US Military Forces are under the direction of the Secretary of the Navy, the US Navy and the US Marine Corps under the most recent National Security Act of 1947.
They are both VERY different. A Navy servicemen is in the Navy. A Marine is in the Marine Corps. The Marine Corps is just a department of the Navy.
Commander is a rank exclusive to the Navy. It is the equivalent of an Army/Air Force/Marine Corps Lieutenant Colonel (O5). A Navy Captain is equivalent to an Army/Air Force/Marine Corps Colonel (O6), whereas a Captain in the Army, Air Force, or Marine Corps is O3. A Navy Captain outranks a Commander, but a Commander outranks an Army, Air Force, or Marine Corps Captain.
SECNAV is an acronym for Secretary of the Navy
O3 in the Army, Marine Corps, and Air Force; O6 is the Navy and Coast Guard (a Navy and Coast Guard Captain is equivalent to an Army/Marine Corps/Air Force Colonel).
In 1798, the U.S. Navy and U.S. Marine Corps were created