i know you can find the code of honor of the legion online, but does the book have it too?French Foreign Legion for beginners, available on Amazon? It costs couple dollars as kindle version ($3.37). It's just basic knowledge+ (mostly), compressed into something You can read in one afternoon. If You did Your research, there won't be much new stuff for You. It's definitely worth the price, though. For me it was worth those few dollars even just for an idea of circuit training a la Legion, he put in there. And for what Thomas Gast does, I was glad to be able to support him, even if it's just couple dollars- if he writes something more, I will probably get it too.
To say short, it is what title suggests: beginner's guide, answers for frequently asked questions. Answered by someone, who knows his business very well. Some informartions and advices, too.
EDIT: Saying that about kindle version, I think that 20$ for paperback is little bit too much, by the way.
Article 1i know you can find the code of honor of the legion online, but does the book have it too?