Which type of light is used to indicate the command "Return to fire station or starting point"?

The correct choice is indicated by flashing white lights, which signify the command "Return to fire station or starting point." Flashing white lights are universally recognized in many emergency services and aviation contexts to signal personnel to return to a designated location, such as a fire station. This command typically follows the conclusion of an incident or a reassessment of the situation that allows for a safe return to the base.

Flashing green lights, while often used as an indication of a clear runway or safe conditions for aircraft operations, signal different instructions and are not specific to returning to a starting point. Alternating white/green lights and alternating green/red flashing lights are used for other specific commands or alerts but do not convey the same message of returning to the base. Understanding these color-coded signals is vital for ensuring communication is clear and effective during emergency operations.