What a wonderul idea. I go to some pretty obscure places and make a point of checking for servicemens headstones and making sure they are looked after whenever I can. It is indeed very sad to see unkempt/damaged/vandalised headstones for the people who proably didn't want to be there, were normal folk like you and I and whose families haven't been to see the grave for a long, long time (if ever).
Temps