I have very recently begun reading Tom Clancy, having so far read in publishing order the Jack Ryan series up to Debt of Honor (including the John Clark centred Without Remorse). And damn, these are fine books indeed, though Debt of Honor was a bit of a slog (way too much time spent on the stock market in that one). So far I'd say Patriot Games is my favourite, though Cardinal of the Kremlin and Without Remorse are also among Clancy's best. Another series of military fiction novels I enjoy are Rick Campbell's Trident Deception series (not the official name of the series, but it gets called that since Trident Deception is the first book in the series). They basically revolve around the intertwining adventures of a US submarine and the National Security Advisor. Great stuff. I'll also take the opportunity to mention Taylor Anderson's Destroyermen about a US Navy Destroyer from WWII that ends up in a parallel Earth in which humanity never evolved and there's a war going on between cute furry creatures and vicious lizard. The first five books are awesome though the series takes a significant slump after that. Hell, everything from Scalzi is worth checking out. I don't think he's disappointed yet.