There are three geographical subspecies: Sciurus griseus griseus (central Washington to the western Sierra Nevada in central California); S. g. nigripes (from south of San Francisco Bay to San Luis Obispo County, California; and S. g. anthonyi, which ranges from San Luis Obispo to northern Baja California).
Unity of command is ensuring unity of effort under one responsible person (or commander) for completing a task. This unity of command is one of the twelve principles of joint operations, and is defined as:
Type Comm (TYCOM), Combat Com (COCOM), Operational Comm (OPCOM), Tactical Control (TACON), Support, Admin Control (ADCON), Coordinating Auth, Direct Liaison Auth (DIRLAUTH) TYCOM - Under Commander in Chief of Fleets, Type Commanders command all ships or units of a certain type. NECC is TYCOM for NCG. COCOM - Authority of a Combatant Commander to command over assigned forces involving organizing and employing commands and forces. Tasks, objectives and direction.