Hi Audrey,
Unfortunately, WWII service records are not available to the public. You have to be able to prove that you are the immediate next-of-kin and that the soldier in question is in fact deceased. So, that avenue won't help you much. I don't even know of an index where you can just check to see if he was in the forces at that time.
You have run into a frustrating problem - that annoying few decades between what is old enough to be publically available, and what is recent enough for the people to still be living. Being born in 1916, his marriage records (if he married) would not be in public domain yet (so far only records up to about the mid-1920s have been released). Same goes for birth records of any children he might have had. And it is not likely that he is still living.
One thing you might try is finding newspapers that served the area. If he was a soldier, it is likely that he is mentioned somewhere (either in an obituary or as a medal recipient, or in a "welcome home" notice). Although without knowing when he died it could be very time consuming to trawl through papers.
I did not have much luck trying to find out about newspapers for that area. Campbellford is now part of the amalgamated "Communities of Trent Hills". Here is the local website if you want to take a look:
http://www.trenthills.ca/home_2.html Their library doesn't seem to have it's own website, but you could try writing them with an enquiry about resources:
http://trent01.sitemajic.com/Library_-77002.htmlLikewise, the local Historical Society can be found here:
http://trent01.sitemajic.com/Heritage_Society_-74376.htmlI think Campbellford is just a bit too far away for their obituaries to appear in the Toronto papers, but if you would like to give it a try the most comprehensive collection is the Toronto Star on-line (every page of the paper availble on pdf for most of the past century). You have to pay to view, but you can get short subscriptions - hourly or daily. And the pound is worth more than 2 Canadian dollars, so you can basically halve any prices.
Hope that helps!
Martha