So I figured this would be the place to start. He wants a good fixed blade knife that he can strap to his back so that if he is force to put his hands behind his head he will have something to grab.
He swore that he will not be captured. He told me that he plans to fight to the death/force them to kill him before he would ever let them capture him and parade him around and behead him or something. The only scenario that has him in "captive" mode is one where he is unconscious when they get to him (IED/Helo crash/ect). If this happens he wants to have a knife right there that he could hopefully use to kill his captors or force them to kill him. So he asked me to "get on my internet gun site" and ask for suggestions on:
1. the knife
2. a holster / system that straps the knife to his back (along his spine)
Background info: He's an US Army LTC that will be working in Baghdad. I don't know that I should divulge much more than that.