I have to say that military publishing has been pretty slow in terms of ebooks. This may have to do with the issues of using photos and maps and such, which can be done (I have a project due out soon), but it's a pain and not as cool as a nice print layout.
Anyway, if you know any books I should look at, with a focus on memoirs and collecting, let me know.
But while I am on this, I have to mention two books which are great fun- although they are military science fiction.
The 'Chronicles of Old Guy,' and 'Space Battleship Scharnhorst and the Library of Doom'. They deal with massive cybernetic armored vehicles in the far future. If you think these are just another Ogre/Bolo books, well they are quite different, contain scads of odd and unusual ideas, and are really great fun. You know they have to be good as the author is my frigging genius brother, and I really, REALLY wanted to hate them as I am the author in this family... but no, they were too good. Anyway, go take a look at the first chapter off 'Old Guy' at Amazon (or B+N, or Smashwords) and if you like the first few pages, it just gets better.