"Military Fitness: A Manual of Special Physical Training" by Nathanael J. Morrison
The book is simply amazing and EXTREMELY detailed. It teaches the ins and outs of training from a guy that has 15 years experience as an operator (and just about as much time as a trainer) who has worked quite a bit with SF.
I'm sure you all have seen a lot of fads and people that claim to know about the topic, but this book is hands down, the best I've ever seen.
Its well worth its weight in gold.
to pick up a copy, go to
www.AlpineTactical.com
same place to get a 10% SOF discount on the best kettlebells as well.
*note: no, I do not work for this company in any way.