Oh, good catch. It was Tolkien who served in WW1, not his son. Sorry about that. And I'm not sure its right to emphasise the contemporary literature from his youth as I did, considering how much he was influenced by epic medieval poetry. I should know better, I did school projects on him.
http://en.wikipedia.org/wiki/Lord_of_the_rings
Although some Tolkien's underlying interest and work dates back to WW I.
http://en.wikipedia.org/wiki/The_Hobbit#Background