No, I don't remember that.
Rex Applegate
Fairbairn
Ed Lovette
Dick Marcinko
Greg Walker
Just to name a few on my shelves. I probably have books on my shelves from half a dozen or more former intelligence/spec-ops guys. Some are fiction most are non-fiction, they run the gamut of "informational manuals" to "political discussions in disguise". I've had some of them since I was four or five years old. As long as their have been soldiers, there have been soldiers who have written books. The existence of special operations soldiers, particularly since WWII has only increased interest in those books. And it wasn't just "intelligence/spec-ops" writing books either. The number of books written by contemporaries of or directly by presidents, military commanders, and state department members is exceedingly high.
I honestly think that what you're seeing right now is more a reflection of the fact that there are more special operations personnel now than ever before. The percentage of those that write books is the same, but there are simply more of them.