United States Indo-Pacific Command in the context of Leadership of the United States Indo-Pacific Command

The United States Forces Japan (USFJ) (Japanese: 在日米軍, Hepburn: Zainichi Beigun) is a subordinate unified command of the United States Indo-Pacific Command. It was activated at Fuchū Air Station in Tokyo, Japan, on 1 July 1957 to replace the Far East Command. USFJ is headquartered at Yokota Air Base in Tokyo and is commanded by the Commander, U.S. Forces Japan who is also commander of the Fifth Air Force. Since then, it is the first and only sustained presence of a foreign military on Japanese soil in its history.

USFJ oversees U.S. military personnel, assets, and installations in Japan, including approximately 55,000 active-duty servicemembers and 15 major bases. USFJ supports U.S. responsibilities under the Treaty of Mutual Cooperation and Security between the United States and Japan, and its activities are governed by the Status of Forces Agreement (SOFA) between the United States and Japan. The command plays a major role in security-related coordination and dialogue with the Government of Japan and the Japan Self-Defense Forces.

The United States Pacific Fleet (USPACFLT) is a theater-level component command of the United States Navy, located in the Pacific Ocean. It provides naval forces to the Indo-Pacific Command. Fleet headquarters is at Joint Base Pearl Harbor–Hickam, Hawaii, with large secondary facilities at Naval Air Station North Island, California.

The Rim of the Pacific Exercise (RIMPAC) is the world's largest international maritime warfare exercise. RIMPAC is held biennially during June and July of even-numbered years from Honolulu, Hawaii, with the exception of 2020, when it was held in August. It is hosted and administered by the Indo-Pacific Command, headquartered at Pearl Harbor, in conjunction with the Marine Corps, the Coast Guard, and Hawaii National Guard forces under the control of the Governor of Hawaii.

The United States Forces Korea (USFK) is a subordinate unified command of U.S. Indo-Pacific Command (USINDOPACOM). USFK was initially established in 1957, and encompasses U.S. combat-ready fighting forces and components under the ROK/US Combined Forces Command (CFC) – a supreme command for all of the South Korean and U.S. ground, air, sea and special operations component commands. Major USFK elements include U.S. Eighth Army (EUSA), U.S. Air Forces Korea (Seventh Air Force), U.S. Naval Forces Korea (CNFK), U.S. Marine Forces Korea (MARFORK) and U.S. Special Operations Command Korea (SOCKOR).

The mission of USFK is to support the United Nations Command (UNC) and Combined Forces Command by coordinating and planning among U.S. component commands, and exercise operational control of U.S. forces as directed by United States Indo-Pacific Command. In addition, USFK is responsible for organizing, training and equipping U.S. forces on the Korean Peninsula, as well as executing ancillary functions such as non-combatant evacuation operations.