Joint Force Maritime Component Commander (JFMCC), is a United States Department of Defense doctrinal term. It is pronounced "Jiff-Mick".
It refers to an individual of general officer rank that is responsible for maritime forces within a joint operations environment. The term "maritime forces" encompasses "Blue water" forces (i.e. naval ships) and "Brown water" forces (i.e. amphibious units).
As defined in Joint Doctrine Document 1-02, the JFMCC is:
"The commander within a unified command, subordinate unified command, or joint task force responsible to the establishing commander for making recommendations on the proper employment of assigned, attached, and/or made available for tasking maritime forces; planning and coordinating maritime operations; or accomplishing such operational missions as may be assigned. The joint force maritime component commander is given the authority necessary to accomplish missions and tasks assigned by the establishing commander."
While the position is usually held by an United States Navy officer in most joint warfighting environments, an officer of another service can be a JFMCC, if that service has the preponderance of maritime forces in theater (i.e. a Marine Corps unit commander)