Yes, John Ronald Reuel Tolkien (the R.R. portion being a family name passed right on down the line, even though J.R.R. didn't seem to care for it).
As for the CS Lewis/JRR Tolkien books, CS Lewis books were indeed published - the Peralandra chronicles, and they are actually fairly good, given the time of their writing. The last one is a bit lengthy and philosophical, but worth a read. Basically about a philoligist (the aforementiond Ransom, based on Tolkien as a bit of an inside joke by Lewis) who ends up traveling to Mars with some criminals.
Tolkien was supposed to right a Time Travel story which was shared, in part, with the Inklings, but never published...Tolkien was always loathe to publish anything anyway, and he didn't care much for the story.
As for Tolkiens military history, he served in Europe in WWI. It was while he was in the hospital that he started work on the Silmarillion. It was one of his sons, Christopher, who served in South Africa with the RAF in WWII.
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Just kidding, but he is my favorite author and I have only written essays about him in High School/College a few dozen times. If you've never read "The Letters of J.R.R. Tolkien", you can get a decent insight of his opinions of himself and the reception of his fictional works.