Red Cross in service to Americans in 1951

The video highlights the vital role of the Red Cross in defense mobilization, emphasizing the formation of new community classes and the humanitarian efforts in battle zones. It underscores the unseen services provided by the organization and calls for immediate individual and community action to join the Red Cross in its mobilization efforts.

What is meant by 'the many unwritten chapters of services performed by this great organization of Mercy'?

Why is it important for people to act now rather than later in terms of mobilization?