He remembers the sound of bullets slamming into his boat. He remembers exactly how many people in his squadron died.
Sim believes Canadians will always remember our country's soldiers, and that Remembrance Day will live on forever.
Our Josh Pagé put together his story.
Alex initially left the military after World War Two, but joined back up for the Korean War. He explains why here in this bonus material for our website.
Part of why Alex believes Remembrance Day will live on because of Canada's Afghanistan veterans.