This OKC3S is currently used by the United States Marines. It has a 8 inch blade and is made out of carbon steel and a. Very good quality sheath.
It's used during boot camp for bayonet training and for over seas deployment. It can fit the AR-15 and M16 rifle that has a bayonet lug on it. This knife was made to replace the M7 Bayonet that was issued during the Vietnam War. This OKC3S is razor sharp, Sharp enough to shave the hair off your arm's and legs. I recommend this knife to anyone.