U.S. Navy MK3 MOD 0 Combat / Diving KnifeISSUED KNIFE OF THE U. S. NAVY SEALS Officially Licensed By the United States Navy The MK 3 MOD 0 Combat Diving Knife is a multi purpose fixed blade fighting knife. Manufactured by Ontario Knife company. This knife is issued to U. S. Navy SEALs during BUD S training and is also used by Reconnaissance Marines at the Combatant Divers Course in Panama City, Florida. The MK 3 is capable of serving as a Dive knife, Fighting knife, or Utility knife. There