Having read nearly all of the novels based on the Halo games, and having interviewed many of the people who’ve written them, I’ve always thought of these books (and the games, and the comics…) as sci-fi space opera stories. But in the following email interview with Troy Denning, the author of seven Halo novels — including the newest, Halo: Outcasts (paperback, Kindle, audiobook) — he explains why these books (and games, and comics…) are more hard science fiction and space marine stories than anything operatic.