Cornwall in the First World War

During this month, each weekday I'm posting a photograph showing Cornwall's First World War.

Here's a mystery. This image was taken earlier this year, and shows a bench-end at St Fimbarrus church, Fowey. The carved wooden angels are holding a shield, engraved with the crest of Britain's First World War Royal Flying Corps. 

But what's the significance of the crest; why is it there? As usual, any help with this would be most appreciated.

My book, 'Cornwall In The First World War', is published by Truran. With 112 pages and 100 images, you'll find it in bookshops across the Duchy. It's also available through Amazon: http://amzn.to/19JbtZm