My Son will deploy soon to southern Afghanistan with 1st Battalion, 5th Marines. He has asked me to get him a good combat knife. This will obviously be a purchase I will make with a great deal of care. I have spent many hours at knifecenter.com looking at various options and reading reviews. I think I have narrowed my choices down to 3 knives and I was hoping that someone could give me some solid educated advice. I am looking for a knife in the 7" blade range + or - and USA made. My Son's only real criteria is a good solid knife with a strong, secure sheath that offers multiple attaching options. The 1st option I am considering is the KA-BAR D2 Extreme with Kydex sheath. I'm not sure weather to go with plain blade or combo. I am familiar with KA-BAR quality from my own years in the Corps. My only real concern with the D2 is the thickness of the handle. My Son is built alot like me, 5'7" ht, 150 lbs, probably slightly smaller that average hands. My 2nd option is the Gerber LHR. My very real concern here is the locking sheath. The last thing in the world I would want is for my Son to be in a situation (God forbid) where he needs his knife in a hurry and has even a slight hesitation getting it out of the sheath. My third option is the Cold Steel Recon Scout 7 1/2". Any advice here would be most welcomed and appreciated.