As many have said, knife fighting in OIF/OEF is a rare occurance but it has happened. That said, I always had a combat knife just in case when I was in Iraq. Prepare for the worst, hope for the best was a motto we Marines lived by. Im not active duty anymore, but if I had to go overseas again I would take the following- 1) A Leatherman like multitool - probably the most useful tool you will ever have on you for obvious reasons. 2) A 3"-4" folder such as a RAT 1 or similar - for general utility like putting up cammo netting, opening MREs, etc. 3) A medium fixed blade such as ESEE 4 - Used on foot patrols for utility, light prying and other stuff you wouldnt want to use a folder for. I know thats not what a knife is designed for, but sometimes you have to do what you have to do. Also, as a last ditch knife if the SHTF. Will it ever come to that? Probably not, but its there if the need arises. 4) Lastly, a combat knife just in case. I would say 6.5"-8" blade, double quillion guard, stainless steel over carbon. The blade length for maximum damage without being too large to wield. The double quillion to help protect your hand from sliding up the blade because God forbid you do have to use it, its probably a bad situation and your fine motor skills will be out the window. Finally, stainless steel because you will probably rarely take it out of the sheath the whole time you are there. Mostly though, just in case you get wet on patrol and dont have the time to clean it off. It happened to me and I didnt have the time to clean my gear until the patrol ended 7 hours later. I never used my combat knife to kill anyone overseas, but i always felt better having it. You can say all you want that "ill just use my rifle" or "knives are for fighting in video games" but ive known a few Marines in Fallujah that got to the point of literally use my kabar or die. Better to have it and not need it than need it and not have it.