I prefer the marine combatives to the US army one by a huge amount.
The marine version is simple but effective while the army one is needlessly complex and relys a lot on ground fighting which is ridiculous in a combat situation. It was obviously developed by a good mixed martial arts guy which is great for a sporting event but nearly useless for real combat. Apparently they want a way for soldiers to compete among themselves rather than to teach them real skills.

I am not making a comment on anything but the 2 different approaches to teaching hand to hand combat. They are both available as PDF on Steves pages along with some other cool manuals. The Marines also use Col Applegates seminal "Kill or Get Killed" as a text. It is one of the best knife fighting books ever. It is also available as a PDF and it really is a must read. It is worth buying the book as well both to have and because the funds go to the Col's widow.