From the Document: "Although the term 'naval forces' is often used to refer specifically to Navy forces, it more properly refers to both Navy and Marine Corps forces, because both the Navy and Marine Corps are naval services. For further discussion, see CRS In Focus IF10484, 'Defense Primer: Department of the Navy,' by Ronald O'Rourke. For a discussion of the Marine Corps that focuses on its organization as a ground-combat force, see CRS In Focus IF10571, 'Defense Primer: Organization of U.S. Ground Forces,' by Barbara Salazar Torreon and Andrew Feickert. [...] U.S. naval forces give the United States the ability to convert the world's oceans--a global commons that covers more than two-thirds of the planet's surface--into a medium of maneuver and operations for projecting U.S. power ashore and otherwise defending U.S. interests around the world. The ability to use the world's oceans in this manner--and to deny other countries the use of the world's oceans for taking actions against U.S. interests--constitutes an immense asymmetric advantage for the United States."
CRS In Focus, IF10486
Congressional Research Service: https://crsreports.congress.gov/