what document establishes the combatant command’s mission and areas of responsibility
Unified combatant command The Unified Command Plan (UCP) establishes the missions, command responsibilities, and geographic areas of responsibility of the unified combatant commands.[5] As of May 2018, there are ten unified combatant commands. Six have regional responsibilities, and four have functional responsibilities. Each time the Unified Command Plan is updated, the organization of the combatant commands is reviewed for military efficiency and efficacy, as well as alignment with national policy.
Joint Special Operations Command The Joint Special Operations Command (JSOC) is a component command of the United States Special Operations Command (USSOCOM) and is charged to study special operations requirements and techniques to ensure interoperability and equipment standardization; plan and conduct special operations exercises and training; develop joint special operations tactics; and execute special operations missions worldwide. It was established in 1980 on recommendation of Colonel Charlie Beckwith, in the aftermath of the failure of Operation Eagle Claw.[2] It is located at Pope Field (Fort Bragg, North Carolina).