United States Forces Korea | 1,938 followers on LinkedIn. The United States Forces Korea (USFK) is a sub-unified command of United States Pacific Command (USPACOM). USFK is the joint headquarters through which U.S. combat forces would be sent to the South Korea/US (ROK/U.S.) Combined Forces Command’s (CFC) fighting components — the combined ground, air, naval, marine and special operations forces component commands.