Perhaps I should have said that it marks the centenary of the beginning of the First World War.
It has been really interesting to read everyone's replies. When I thought about posting this topic, I didn't consider the aspect of 'an agenda', an totally agree that GC should be kept free from political, religious and charity agendas. That said a 'Lest we Forget' type cache is about people visiting a monument/place, the same as any other cache placed near any type of monument.
Most cities, towns and villages have a memorial, some with hundreds of names, others have just a couple of names. Many people walk by these memorials every day. Caches placed near them could encourage people to find out more about their local community and it's history.
Thanks for all the replies!