The Fleet Marine Force, Pacific (FMFPAC) is the largest maritime landing force in the world. Its units are spread across the Pacific Ocean and reports to the United States Pacific Command. It is headquartered at MCB Camp H. M. Smith, HI and directs and commands all the subordinate elements of the Navy Expeditionary Strike Force and Marine Air-Ground Task Force components that follow under the 3rd, 5th, and 7th Fleet and the Marine Corps Forces, Pacific (MARFORPAC). The Commanding General of Marine Corps Forces, Pacific is dual-posted as the Commanding General of Fleet Marine Force, Pacific. FMFPAC is under operational control of the Commander, United States Pacific Fleet (COMPACFLT), when deployed.

The U.S. Marine Corps Forces, Pacific (MARFORPAC) is the Marine Corps service component command of U.S. Indo-Pacific Command. It is the largest field command in the Marine Corps and is headquartered at Camp H. M. Smith in Hawaii. The MARFORPAC area of responsibility covers more than half of the Earth's surface.