Like Sailor Steve, my dad was too young to fight in WWII (born in 1930) but did National Service in the RAF.
My mum's dad worked at a cipher/signal intercept establishment somewhere near Edinburgh. In the lead-up to D-Day he disappeared for a week when they weren't allowed to go home - when he eventually got home my granny nearly brained him, she thought he was having an affair!
My mum's grandfather was killed in the trenches at Loos:
http://www.cwgc.org/search/certificate.aspx?casualty=1768050
My dad's dad was a WWI dispatch rider at the front line, until he was invalided home after being gassed. He was never fully fit again and died before I was born, from a related illness.