What is a Unified Combatant Command?


A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defence that is composed of units from two or more service branches of the United States Armed Forces, and conducts broad and continuing missions.

There are (as of January 2021) 11 unified combatant commands and each are established as the highest echelons of military commands, in order to provide effective command and control of all US military forces, regardless of branch of service, during peace or during war time. Unified combatant commands are ‘joint’ commands and have specific badges denoting their affiliation.

Each unified combatant command is led by a combatant commander (CCDR), who is a four-star (OF-9) general or admiral. The combatant commanders are entrusted with a specific type of non-transferable command authority over assigned forces, regardless of branch of service. The chain of command for operational purposes (per the Goldwater-Nichols Act) goes from the president of the United States through the secretary of defence to the combatant commanders.

Unified Command Plan

The Unified Command Plan (UCP) establishes the missions, command responsibilities, and geographic areas of responsibility of the combatant commands. Each time the Unified Command Plan is updated, the organisation of the combatant commands is reviewed for military efficiency and efficacy, as well as alignment with national policy.

The first UCP was approved on 14 December 1946.

Chain of Command

Each combatant command (CCMD or COCOM) is headed by a four-star (OF-9) general or admiral (the CCDR or combatant commander) recommended by the Secretary of Defence, nominated for appointment by the President of the United States, confirmed by the Senate and commissioned, at the President’s order, by the Secretary of Defence. The Goldwater-Nichols Act and its subsequent implementation legislation also resulted in specific Joint Professional Military Education (JPME) requirements for officers before they could attain flag or general officer rank thereby preparing them for duty in Joint assignments such as UCC staff or Joint Chiefs of Staff assignments, which are strictly controlled tour length rotations of duty. However, in the decades following enactment of Goldwater-Nichols, these JPME requirements have yet to come to overall fruition. This is particularly true in the case of senior naval officers, where sea duty / shore duty rotations and the culture of the naval service has often discounted PME and JPME as a measure of professional development for success. Although slowly changing, the JPME requirement still continues to be frequently waived in the case of senior admirals nominated for these positions.

The operational chain of command runs from the President to the Secretary of Defence to the combatant commanders of the combatant commands. The Chairman of the Joint Chiefs of Staff may transmit communications to the Commanders of the combatant commands from the President and Secretary of Defence and advises both on potential courses of action, but the Chairman does not exercise military command over any combatant forces. Under Goldwater-Nichols, the service chiefs (also four stars in rank) are charged with the responsibility of the “strategic direction, unified operation of combatant commands, and the integration of all land, naval, and air forces in an efficient “unified combatant command” force. Furthermore, the Secretaries of the Military Departments (i.e. Secretary of the Army, Secretary of the Navy, and the Secretary of the Air Force) are legally responsible to “organise, train and equip” combatant forces and, as directed by the Secretary of Defence, assign their forces for use by the combatant commands. The Secretaries of the Military Departments thus exercise administrative control (ADCON) rather than operational control (OPCON – the prerogative of the combatant commander) over their forces.

Each combatant command can be led by a general or flag officer from any of the military services.

Sub-Unified Combatant Commands

A sub-unified command, or, subordinate unified command, may be established by combatant commanders when authorized to do so by the Secretary of Defense or the president.[30] They are created to conduct a portion of the mission or tasking of their parent geographic or functional command. Sub-unified commands may be either functional or geographic, and the commanders of sub-unified commands exercise authority similar to that of combatant commanders.

Examples of current and former sub-unified commands are the Alaskan Command (ALCOM) under USNORTHCOM, the United States Forces Korea (USFK) under USINDOPACOM, and United States Forces—Afghanistan (USFOR-A) under USCENTCOM.

Command Authority

Four types of command authority can be distinguished:

  • Combatant Command (COCOM): unitary control (cannot be further delegated by the combatant commander CCDR).
  • Administrative Control (ADCON) of the command function of “obtaining resources, direction for training, methods of morale and discipline”.
  • Operational Control (OPCON) of a command function say, sustainment. In that case, OPCON is embodied in the Army Field Support Brigades (AFSBs).
  • Tactical Control (TACON) of say, sustainment, as embodied in a Contracting Support Brigade.


Unified combatant commands are organised either on a geographical basis (known as “area of responsibility”, AOR: Figure 1 below) or on a functional basis such as special operations, power projection, or transport.

Currently, seven combatant commands are designated as geographical, and four are designated as functional. Unified combatant commands are ‘joint’ commands and have specific badges denoting their affiliation.

Figure 1: Geographic areas of responsibility for six land-based geographic combatant commands. Space Command makes the seventh geographic command.
  • Geographic Combatant Commands:
    • Africa Command (USAFRICOM): Established in October 2008.
      • US Africa Command was established on 01 October 2007 as a sub-unified command under US European Command.
      • It separated from US European Command and was elevated to full unified command status on 01 October 2008.
    • Central Command (USCENTCOM): Established in January 1983.
    • European Command (USEUCOM): Established in August 1952.
    • Indo-Pacific Command/Pacific Command (USINDOPACOM/USPACOM): Established in January 1947.
    • Northern Command (USNORTHCOM): Established in October 2002.
    • Southern Command (USSOUTHCOM): Established in June 1963.
    • Space Command (USSPACECOM): Established in August 2019.
      • The first US Space Command was originally established as a unified combatant command in September 1985.
      • It was disestablished in October 2002.
      • The second US Space Command, which is considered separate from the first, was established on 29 August 2019.
  • Functional Combatant Commands:
    • Cyber Command (USCYBERCOM): Established in May 2018.
      • US Cyber Command was established on 23 June 2009 as a sub-unified command under US Strategic Command.
      • It separated from US Strategic Command and was elevated to full unified command status on 04 May 2018.
    • Special Operations Command (USSOCOM): Established in April 1987.
    • Strategic Command (USSTRATCOM): Established in June 1992.
    • Transportation Command (USTRANSCOM): Established in 1987.

Brief History

The current system of unified commands in the US military emerged during World War II with the establishment of geographic theatres of operation composed of forces from multiple service branches that reported to a single commander who was supported by a joint staff. A unified command structure also existed to coordinate British and US military forces operating under the Combined Chiefs of Staff, which was composed of the British Chiefs of Staff Committee and the US Joint Chiefs of Staff.

World War II Era

In the European Theatre, Allied military forces fell under the command of the Supreme Headquarters Allied Expeditionary Force (SHAEF). After SHAEF was dissolved at the end of the war, the American forces were unified under a single command, the US Forces, European Theatre (USFET), commanded by General of the Army Dwight D. Eisenhower. A truly unified command for the Pacific War proved more difficult to organise as neither General of the Army Douglas MacArthur nor Fleet Admiral Chester W. Nimitz was willing to be subordinate to the other, for reasons of interservice rivalry.

The Joint Chiefs of Staff continued to advocate in favour of establishing permanent unified commands, and President Harry S. Truman approved the first plan on 14 December 1946. Known as the “Outline Command Plan,” it would become the first in a series of Unified Command Plans. The original “Outline Command Plan” of 1946 established seven unified commands: Far East Command, Pacific Command, Alaskan Command, Northeast Command, the US Atlantic Fleet, Caribbean Command, and European Command. However, on 05 August 1947, the CNO recommended instead that CINCLANTFLT be established as a fully unified commander under the broader title of Commander in Chief, Atlantic (CINCLANT). The Army and Air Force objected, and CINCLANTFLT was activated as a unified command on 01 November 1947. A few days later, the CNO renewed his suggestion for the establishment of a unified Atlantic Command. This time his colleagues withdrew their objections, and on 01 December 1947, the US Atlantic Command (LANTCOM) was created under the Commander in Chief, Atlantic (CINCLANT).

Under the original plan, each of the unified commands operated with one of the service chiefs (the Chief of Staff of the Army or Air Force, or the Chief of Naval Operations) serving as an executive agent representing the Joint Chiefs of Staff. This arrangement was formalised on 21 April 1948 as part of a policy paper titled the “Function of the Armed Forces and the Joint Chiefs of Staff” (informally known as the “Key West Agreement”). The responsibilities of the unified commands were further expanded on 07 September 1948 when the commanders’ authority was extended to include the coordination of the administrative and logistical functions in addition to their combat responsibilities.

Cold War Era

Far East Command and US Northeast Command were disestablished under the Unified Command Plan of 1956-1957.

A 1958 “reorganisation in National Command Authority relations with the joint commands” with a “direct channel” to unified commands such as Continental Air Defence Command (CONAD) was effected after President Dwight Eisenhower expressed concern about nuclear command and control. CONAD itself was disestablished in 1975.

Although not part of the original plan, the Joint Chiefs of Staff also created specified commands that had broad and continuing missions but were composed of forces from only one service. Examples include the US Naval Forces, Eastern Atlantic and Mediterranean and the US Air Force’s Strategic Air Command. Like the unified commands, the specified commands reported directly to the JCS instead of their respective service chiefs. These commands have not existed since the Strategic Air Command was disestablished in 1992. The relevant section of federal law, however, remains unchanged, and the President retains the power to establish a new specified command.

The Goldwater-Nichols Defence Reorganisation Act of 1986 clarified and codified responsibilities that commanders-in-chief (CINCs) undertook, and which were first given legal status in 1947. After that act, CINCs reported directly to the United States Secretary of Defence, and through him to the President of the United States.

Post Soviet Era

The US Atlantic Command became the Joint Forces Command in the 1990s after the Soviet threat to the North Atlantic had disappeared and the need rose for an integrating and experimentation command for forces in the continental United States. Joint Forces Command was disbanded on 03 August 2011 and its components placed under the Joint Staff and other combatant commands.

On 24 October 2002, Secretary of Defense Donald H. Rumsfeld announced that in accordance with Title 10 of the US Code (USC), the title of “Commander-in-Chief” would thereafter be reserved for the President, consistent with the terms of Article II of the United States Constitution. Thereafter, the military CINCs would be known as “combatant commanders”, as heads of the unified combatant commands.

A sixth geographical unified command, United States Africa Command (USAFRICOM), was approved and established in 2007 for Africa. It operated under US European Command as a sub-unified command during its first year, and transitioned to independent Unified Command Status in October 2008. In 2009, it focused on synchronising hundreds of activities inherited from three regional commands that previously coordinated US military relations in Africa.

President Donald Trump announced on 18 August 2017 that the United States Cyber Command (USCYBERCOM) would be elevated to the status of a unified combatant command from a sub-unified command. It was also announced that the separation of the command from the NSA would be considered. USCYBERCOM was elevated on 04 May 2018.

Vice President Mike Pence announced on 18 December 2018 that President Donald Trump had issued a memorandum ordering the stand-up of a United States Space Command (USSPACECOM). A previous unified combatant command for unified space operations was decommissioned in 2002. The new USSPACECOM will include “(1) all the general responsibilities of a Unified Combatant Command; (2) the space-related responsibilities previously assigned to the Commander, United States Strategic Command; and (3) the responsibilities of Joint Force Provider and Joint Force Trainer for Space Operations Forces”. USSPACECOM was re-established on 29 August 2019.


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