My great-(great?)-uncle, sailed off to join the RAF in WWII. Transport ship was sunk in the mid-Atlantic, floated around with another two blokes in a life-raft for around a month before being picked up and making it to England.
Flew Lancasters before finally being shot down over Germany. His crew got out but his body was never found. Never got the chance to be someone's great-grandfather.
He is my link to aviation, and I'm thinking of him on this day, along with my other relatives - including my father who was an Engineer who served in Vietnam and isn't with us today - and all the other men who went out and served for us.
Lest we forget.