Tolkien, C. S. Lewis and wartime civil defence

Can you imagine a Home Guard unit led by Tolkien, and what would you call it?

The unit-name suggestion is unclear. The reply focuses on Tolkien's ARP service in Oxford and his links with C. S. Lewis in the Home Guard.

The question imagines Tolkien commanding a Home Guard unit and asks what it should be called. The response turns to an account of his work as an Air Raid Precautions warden in Oxford. It describes nighttime patrols, blackout enforcement and duties during raids. Tolkien is said to have been kept out of the Home Guard because of age and university workload, while remaining closely involved with his friend C. S. Lewis, who served in it. The description of Tolkien as a link between ARP and the Home Guard comes from notes consulted during the answer. A book is mentioned, but its bibliographic details are not stated clearly enough here to identify it. The unit-name suggestion at the start of the exchange is also unclear.