United States Indo-Pacific Command

Mission

In 2016, the command's mission was:

United States Pacific Command protects and defends, in concert with other U.S. Government agencies, the territory of the United States, its people, and its interests. With allies and partners, we will enhance stability in the Indo-Asia-Pacific region by promoting security cooperation, encouraging peaceful development, responding to contingencies, deterring aggression, and, when necessary, fighting to win. This approach is based on partnership, presence, and military readiness.

We recognize the global significance of the Indo-Asia-Pacific region and understand that challenges are best met together. Consequently, we will remain an engaged and trusted partner committed to preserving the security, stability, and freedom upon which enduring prosperity in the Indo-Asia-Pacific region depends. We will collaborate with the Services and other Combatant Commands to defend America's interests.

Geographic scope

The command's area of responsibility (AOR) encompasses the Pacific Ocean from Antarctica at 92°W, north to 8°N, west to 112°W, northwest to 50°N/142°W, west to 170°E, north to 53°N, northeast to 62°30'N/175°W, north to 64°45'N/175°W, south along the Russian territorial waters to the People's Republic of China, Mongolia, the Democratic People's Republic of Korea, the Republic of Korea, and Japan; the countries of Southeast Asia and the southern Asian landmass to the western border of India; the Indian Ocean east and south of the line from the India coastal border west to 68°E, south along 68°E to Antarctica; Australia; New Zealand; Antarctica, and Hawaii.

In all, it encompasses:

36 nations

More than half the world's population

3,200 different languages

5 of 7 collective defense treaties

Force structure

History

Establishment of unified commands in the Pacific

The command has evolved through the consolidation of various commands in the Pacific and Far East. Its origins can be traced to the command structure established early in World War II to wage the war in the Pacific.

In April 1942, U.S. military forces in the Pacific Theatre were divided into two commands: the South West Pacific Area (SWPA) under Army General Douglas MacArthur; and the Pacific Ocean Areas (POA) under Navy Admiral Chester W. Nimitz. Each had command of all U.S. military forces assigned to his area. The authority of the POA Commander-in-Chief (CINCPOA) was technically separate from that of the Commander in Chief, Pacific Fleet (CINCPAC), but Admiral Nimitz was assigned to both positions and bore the title CINCPAC/CINCPOA.

Efforts to establish a unified command for the entire Pacific AOR proved impossible during the war. The divergent interests of the Army and the Navy precluded the subordination of either of the two principal commanders in the Pacific Theatre. When the war ended in September 1945, the command arrangement carried forward with Fleet Admiral Nimitz as CINCPAC/CINCPOA and General of the Army MacArthur as Commander in Chief, U.S. Army Forces Pacific (CINCAFPAC).

Command arrangements after World War II were defined by the "Outline Command Plan" – in a sense, the first Unified Command Plan (UCP) – approved by President Harry S. Truman on 14 December 1946 and authorized by the National Security Act of 1947. The plan called for the establishment of seven unified combatant commands as "an interim measure for the immediate postwar period."

The first three unified commands were established in the Pacific. The Joint Chiefs of Staff implementing directive of 16 December 1946 established the Far East Command (FECOM), Pacific Command (PACOM), and Alaskan Command (ALCOM) effective 1 January 1947. The commands, their areas of responsibility, and their missions were as follows:

Far East Command: U.S. forces in Japan, Korea, the Ryukyus, the Philippines, and the Mariana and Bonin Islands. The Commander-in-Chief, Far East (CINCFE) would carry out occupation duties, maintain the security of the command, plan and prepare for a general emergency in the area, support the Commander-in-Chief, Pacific (CINCPAC), and command U.S. forces in China in an emergency.

The Korean War

The outbreak of the Korean War and subsequent developments in the Far East tested the U.S. unified command structure in the Pacific. Although General MacArthur, as CINCFE, had been relieved of responsibility for South Korea, early U.S. reaction to North Korea's invasion of the South on 25 June 1950 came through his command. On 10 July, at the request of the United Nations, President Truman directed General MacArthur to establish the United Nations Command (UNC) for the purpose of directing operations against North Korean forces. U.S. forces assigned to FECOM were assigned to UNC with General MacArthur designated Commander-in-Chief, UNC (CINCUNC). The primary responsibility of CINCFE, however, remained the defense of Japan. During the war, CINCPAC was ordered to support CINCUNC/CINCFE.

With CINCFE focused on combat operations during the Korean War, the Joint Chiefs of Staff, over strong objection from FECOM, transferred the Mariana, Bonin and Volcano Islands to PACOM. In late 1951, PACOM was also assigned responsibility for the Philippines, the Pescadores, and Formosa (Taiwan).

Reorganization of 1956

The new Unified Command Plan approved by Secretary of Defense Charles Wilson on 21 June 1956 produced significant changes to the command structure in the Pacific. ALCOM would remain as a unified command because of its strategic location, retaining its mission for the ground defense of the Alaskan region. Its other responsibilities, however, were reduced: the duty for the protection of sea communications in Alaskan waters was assumed by PACOM. The responsibilities of the Continental Air Defense Command (CONAD) would be likewise expanded to include the air defense of Alaska and the Northeast.

UCP 1956 also disestablished FECOM as a separate unified command. U.S. military deployments to Japan and Korea were decreasing after the end of Japanese reconstruction and the Korean War. The JCS, therefore, believed that the divided command structure in the Pacific should be abolished and FECOM's responsibility reassigned to PACOM. A subsequent outline plan to disestablish FECOM and transfer its responsibilities was approved by SECDEF and the JCS effective 1 July 1957. Under the plan, two subordinate unified commands under CINCPAC were established: Commander, U.S. Forces Japan (COMUSJAPAN) and Commander, U.S. Forces Korea (COMUSKOREA). The latter was dual-hatted as CINCUNC.

The UCP further specified that no unified commander would exercise direct command of any of its Service components or subordinate commands. As such, Admiral Felix Stump gave up direct command of the Pacific Fleet, delegating the responsibility of CINCPACFLT to his Deputy, Admiral Maurice E. Curts. CINCPAC's staff was thereafter separated from CINCPACFLT's staff and moved from Pearl Harbor to a new headquarters building (the former Aiea Naval Hospital) at Camp H.M. Smith. Service components for the Army and Air Force – U.S. Army Pacific (USARPAC) and U.S. Pacific Air Forces (PACAF) – were also assigned to PACOM.

The Vietnam War

Command over U.S. forces engaged in the Vietnam War was designated by CINCPAC to three subordinate commands. U.S. Military Assistance Command, Vietnam (USMACV), activated 8 February 1962 to direct U.S. support to South Vietnam's military forces, largely controlled all U.S. forces and operations within South Vietnam. Naval gunfire support and air strikes on targets in Vietnam, however, were delegated to PACFLT and the U.S. 7th Fleet. PACAF and PACFLT were responsible for conducting air and naval operations against North Vietnam and Laos. Control of B-52s employed to conduct airstrikes against targets in South Vietnam remained under the Strategic Air Command.

Command adjustments, 1971–1979

A new Unified Command Plan was approved in 1971. Effective 1 January 1972, the Pacific Command assumed responsibility for the Indian Ocean and the countries of southern Asia extending westward to the eastern border of Iran (which then fell under EUCOM's responsibility). The Alaskan Command transferred responsibility for the Aleutian Islands and parts of the Arctic Ocean to PACOM, as well. ALCOM would remain a distinct unified command until it was disestablished by another Unified Command Plan on 1 July 1975. An amendment to this plan on 1 May 1976 adjusted PACOM's boundaries yet again. The amendment gave CINCPAC responsibility for the entire Indian Ocean to the east coast of Africa, including the Gulfs of Aden and Oman and all of the Indian Ocean Islands excepting the Malagasy Republic. This decision expanded PACOM's AOR across more than 50% of the Earth's surface an area of over 100 million square miles.

U.S. Army Pacific (USARPAC) was disestablished 31 December 1974 as part of a bid by the Army to reduce its headquarters. The much smaller U.S. Army CINCPAC Support Group (CSG) took over USARPAC's duty to assist and coordinate with CINCPAC Headquarters and PACOM service components on Army matters. In 1979, U.S. Army Western Command (WESTCOM) was activated as the new Army component for PACOM. WESTCOM was redesignated USARPAC effective 30 August 1990.

Unified Command Plan of 1983

UCP 1983 dramatically increased the size of PACOM's AOR. While the establishment of U.S. Central Command (USCENTCOM) for the Middle East on 1 January 1983 meant PACOM delegated responsibility for Afghanistan and Pakistan to the new command, it took on responsibility for China, North Korea and Madagascar as military officials reasoned that issues arising from those countries could be best handled at the unified command level.

At the request of then-CINCPAC Admiral William Crowe, his title and that of his command were changed to USCINCPAC and USPACOM, respectively.

Boundary adjustment and Alaskan Command, 1989

On 26 June 1989, Secretary of Defense Dick Cheney endorsed the recommendation from the Joint Chiefs of Staff to reassign the Gulfs of Aden and Oman from USPACOM to USCENTCOM's AOR. Though a modest shift, the change meant that the new boundary between the commands would no longer cut through the Strait of Hormuz. On 1 October 1989, the defense of Alaska and all units stationed there passed to USPACOM, which subsequently raised Alaskan Command (ALCOM) as a subordinate command.

Transfers of responsibility, 2002–2006

Under UCP 2002, effective 21 January, Secretary of Defense Donald Rumsfeld assigned Antarctica to USPACOM. Secretary Rumsfeld also approved the assignment of responsibility for Russia to EUCOM with USPACOM in a supporting role for the Siberia and Russian Far East. Later reassignments under the 2004 and 2006 plans placed the entire Seychelles Archipelago in the USCENTCOM's AOR and extended U.S. Northern Command (USNORTHCOM)'s boundary westward to encompass all of the Aleutian Islands, respectively.

On 24 October 2002, the Secretary issued a memorandum declaring that the title "Commander in Chief" should only refer to the President of the United States. Effective that date, all combatant commanders deleted "in Chief" from their titles. USCINCPAC was redesignated Commander, U.S. Pacific Command (CDRUSPACOM).

Transfer of Alaskan Command and missile warning

In a move to streamline command and control of forces in Alaska and integrate forces defending North America, Secretary of Defense Chuck Hagel approved the transfer of ALCOM to USNORTHCOM on 1 October 2014.

In 2018, Hawaii newspapers highlighted the role of the command in providing missile warning to the state, after a missile scare. Within PACOM boundaries, PACOM must make the decision that an incoming ballistic missile is a threat to the United States. Hawaii is the only state in the United States with a pre-programmed Wireless Emergency Alert that can be sent quickly to wireless devices if a ballistic missile is heading toward Hawaii. If the missile is fired from North Korea, the missile would take approximately 20 minutes to reach Hawaii. PACOM would take less than 5 minutes to make a determination that the missile could impact Hawaii and would then notify the Hawaii Emergency Management Agency (HI-EMA). HI-EMA would issue the Civil Defense Warning that an inbound missile could impact Hawaii and that people should Shelter in place: Get Inside, Stay Inside, and Stay Tuned. People in Hawaii would have 12 to 15 minutes before impact. The Federal Emergency Management Agency is not required to be notified for approval to cancel an alert. Signal carriers allow people to block alerts from state and law enforcement agencies, but not those issued by the President. FEMA can send alerts to targeted audiences but has not implemented this as of January 2018. Other states can take as long as 30 minutes to create, enter and distribute a missile alert.

The Wireless Emergency Alert system was tested nationally for the first time in October 2018.

Renaming to Indo-Pacific Command, 2018

On 30 May 2018, at the change-of-command ceremony between Admirals Harry B. Harris Jr. and Philip S. Davidson, Defense Secretary Jim Mattis announced that Pacific Command had been renamed Indo-Pacific Command "in recognition of the increasing connectivity of the Indian and Pacific Oceans." The rebranding reflected the growing importance of Indo–United States relations. U.S. officials stated that the change was instituted to "better reflect the command's areas of responsibility, which includes 36 nations as well as both the Pacific and Indian Oceans."

Rebranding as Pacific Command, 2026

On June 16, 2026, the Department of Defense rebranded the command as the "United States Pacific Command". In a press release, command officials said the return of the old name "honors the command’s deep historical roots, fostering a sense of pride and collective spirit among all who serve in the Pacific."

The name is only a "secondary title" because the command's formal name is set by a 2018 law, Defense Secretary Pete Hegseth said in an internal memo. “Statutory references to United States Indo-Pacific Command shall remain controlling until changed subsequently in law,” the memo says. This is "the same administrative workaround" that Hegseth used to rebrand the Defense Department as the Department of War, the Associated Press wrote.

List of commanders

While any qualified officer in the U.S. Armed Forces can be appointed as commander of PACOM, only a Navy officer has ever held this office.