Ka-Bar U.S.M.C. Fighting Knife L/S KB1217. The Ka-Bar KB1217 was originally designed to serve our troops during World War II, and because it did such a fantastic job all those years ago, this knife is still being used. It has a blade length of 7 inches made of 1095 carbon, and features a leather handle and leather sheath. If there was ever knife you could truly count on, this is it!