USMC Heavy Duty Combat Knife KS4853P - Tactical, Survival & Hunting Knives USMC Heavy Duty Combat knife.USMC and Insignia printed on blade. Overall Length: 13-5/8".Blade Length: 8-1/2" Long, 3/16" thick.Blade Material: Stainless Steel with Stealth black finish. Handle Hard Rubber .Sheath: Ballistic Nylon Custom made.