I was wondering what exactly they did, how close or far they were from action, etc.

If possible, info Canadian ones would be fantastic. My grandfather took part (I think) in the liberation of Caen and the Falaise pocket. I know from my father that he worked a lot with radar/microwave equipment as he moved across Europe.

I'm trying to get a sense of what he did during the war, but he passed away a few years ago so any info, no matter how general, would be really appreciated. Thanks!