The Command Master Chief is the senior enlisted person on any Starfleet starbase or ground installation. They are responsible for the well-being of all enlisted personnel and act as a liaison between the enlisted personnel and the officers. On most installations, this person holds the grade of Master Chief Petty Officer, though Senior Chief Petty Officers and Command Master Chief Petty Officers do frequently hold this position, depending on the size of the crew. The Command Master Chief reports directly to the Commanding Officer and Executive Officer.

On starships, this position is known as the Chief of the Boat.