async def METHOD_NAME(cls) -> None:
    """
    Shuts down a base mission. This is called when the mission server is shutting
    down, and can be used to ensure that resources are properly closed. This
    is called before each individual child mission is shutdown using :meth:`~.shutdown`.
    Any resources that were setup using :meth:`~.setup_base` should be considered for
    shutdown using this method.
    """
    pass