MARFORPAC is the largest field command in the U.S. Marine Corps. Headquartered at Camp H. M. Smith in Hawaii, it commands all Marine Corps bases and stations in the Pacific and on the West Coast of the United States. Longstanding missions for MARFORPAC include the defense of South Korea and Japan and also the U.S. West Coast and Alaska. MARFORPAC also provides combat units to support Operation Iraqi Freedom and Operation Enduring Freedom. They also have Marine Expeditionary Units embarked to counter threats to the interests of the United States.

MCB Hawaii is comprised of MCB Hawaii, Kaneohe Bay, Camp H. M. Smith, Manana Family Housing, the Pearl City Warehouse Annex, Pu'uloa Range Complex, Marine Corps Training Area Bellows, and Waikane Valley Training Area. The two major installations are Kaneohe Bay and Camp H.M. Smith. MCB Hawaii is headquartered at Kaneohe Bay, on Windward Oahu.

Located on Oahu's Mokapu Peninsula, Marine Corps Base Hawaii, Kaneohe Bay is home to more than 16,000 Marines, Sailors, family members and civilian employees. The base's position in the Pacific makes it an ideal location for strategic deployment to the Western Pacific.

The command's mission includes maintaining facilities, (which includes numerous training areas) as well as providing services that support readiness and global projection of operating forces to conduct Expeditionary Maneuver Warfare; and by promoting the well-being, morale and safety of military personnel, their families and the civilian workforce.

The air facility maintains and operates airfield facilities, (which includes a 7,700-foot runway), to support the readiness and global projection of operating forces.

The largest command on MCB Hawaii, Kaneohe Bay is III Marine Expeditionary Forces Hawaii. III MEF Hawaii combines ground combat, aviation combat and combat service support elements into a cohesive force in readiness. Providing trained, combat-ready, air-ground forces capable of conducting expeditionary maneuver warfare whenever or wherever directed, III MEF Hawaii trains constantly under conditions as close to combat as possible. A few examples of the exercises conducted were throughout the Pacific Basin to include the Republic of Korea, Thailand, Australia, Japan, Guam, Tahiti, the Kingdom of Tonga, the Philippines, neighboring Hawaiian Islands and the mainland United States. This training includes amphibious, combined arms and special operations exercises.