Cold Steel Knives SK-5 Fixed Blade Knife - Simply put， the Cold Steel SRK (Survival Rescue Knife) was designed specifically with this in mind. A popular knife with Military and Tactical Law Enforcement Personnel， the SRK is the standard issue knife of the Navy SEALS for their BUDS - or Basic Underwater Demolition training - the SRK has proved its worth time and time again in the most demanding environments. Whatever the mission， we're confident that the SRK is the knife for you! With good all-round toughness and excellent edge holding capabilities， as well as excellent abrasion resistance it has stood the test of time.