Marine Expeditionary Force
The Marine Corps operates many major bases, 14 of which host operating forces, several support and training installations, as well as satellite facilities. Marine Corps bases are concentrated around the locations of the Marine Expeditionary Forces, though reserve units are scattered throughout the United States. The principal bases are Camp Pendleton on the West Coast, home to I Marine Expeditionary Force; Camp Lejeune on the East Coast, home to II Marine Expeditionary Force; and Camp Butler in Okinawa, Japan, home to III Marine Expeditionary Force.