Yes. It is important that all departments and agencies have a clear sense of the overall risks that their departments are meeting, that they are ensuring that actions against those risks align with the priorities of their departments.
They ensure that they have the appropriate internal governance and overall planning and processes within their departments to do what's needed to ensure the security, to ensure such things as information is properly secured, to ensure they have such things as the appropriate business continuity plans, and the right kind of physical security and cybersecurity. All these important elements are brought together in an integrated plan, which the department security plan is aimed at ensuring.