See “Hallowed Grounds” on PBS. This is an education on the price of liberty.
http://www.pbs.org/program/hallowed-grounds/
The graves of Canada's war dead are tended by the Commonwealth War Graves Commission. This is an intergovernmental agency made up of representatives of UK, Australia, Canada, India, New Zealand and South Africa. Annually, they repair gravestones and also replace approximately 7,000 gravestones that cannot be repaired. Even yet, they bury several mostly WWI vets whose bodies are discovered each year.
Here is a video of someone's visit to Bény-Sur-Mer Canadian War Cemetery, where over 2,000 Canadians killed in Normandy are buried, including those who surrendered and were murdered by Kurt Meyer's 12th SS Panzer Division Hitlerjugend.