I wrote the first book in the Warship Perspectives Series, Fletcher, Gearing and Sumner Class Destroyers in WW2, in 1996 (WR Press). I did two self-published titles, one on the Tiger I, another on USN Camouflage Practices.
I wrote a book on Fletchers for Barnes and Noble in 2004, but it was never published. Never got a reason why, as it was a flat-rate, non-royalty contract.
I've got 3 books in various stages of completion, 2 on scale modeling, one (believe it or not) on surviving the zombie apocalypse.

Amazingly, my agent has generated more interest for the zombie book than the modeling books!
On top of that, I've written dozens of articles for magazines, and created my own scale modeling magazine a few years ago. It was shut down after my publisher bilked huge amounts of money from the company (not me!).