First of all, if you bring yourself in a situation, where you as a soldier has to resort to a knife, something has gone terribly wrong and/or someone failed abysmally. Further more, this persons MOS seems to hinge around his ability to speak several languages. If he is a terp, he most certainly should not be in the fray. Sxxt happens of course. In regards to the knife - for a soldier weight considerations are paramount. One already carries a lot of gear and you already have gear items sticking out from your body every which way (depending on your job, its guns, rucks, sat phones (in my case) and a multitude of other items). You dont want a huge heavy pig sticker to further burden you or get in the way of other gear. Look at the size of for example Daniel Winklers knives and you get a good impression of the size and shape of what is acceptable to carry. Yes, you see pics of big knives being carried, but they are very very far from the norm. Often soldiers carry a big knife once and then leave it behind. Rather a smaller sized knife carried than the big pig sticker left behind because its heavy and cumbersome. Carry method; whether kydex or leather (I like kydex because its sweat and wear resistant), its great to mount a Kydex plate for carry. On the knife sheath type, that I prefer, I can use Malice clips and or MOLLE carry. To be able to use the clips for belt or MOLLE carry is a huge advantage. This just my experience from a couple of deployments.