The Navy went to Emerson

After a disastrous helicopter crash in 1999 resulting in the deaths of six Marines and one sailor, the US Navy performed an assessment of their equipment and decided among other things that they needed a new search and rescue knife.[8][27] The Ka-bar knives issued to the SBUs (Special Boat Units) had catastrophically failed to cut the Marines free from their webbing.[8]

The Navy went to Emerson, who designed and fabricated a working prototype within 24 hours.[8] They found that it met their needs, and the model was dubbed the "SARK" (Search and Rescue Knife).[27] The SARK is a folding knife with a wharncliffe-style blade and a blunt tip designed so a rescuer could cut trapped victims free without stabbing them. The knife features Emerson's Wave.[8]n Seeing another need in the police community, Emerson replaced the blunt end of the SARK with a pointed end and named it the "P-SARK", or Police Search And Rescue Knife. The Ontario, California Police Department consulted Emerson to produce written policy for the carry and deployment of the P-SARK knives in their department.[49] In 2005, the Navy changed the requirements on the SARK to incorporate a guthook on the back of the blade for use as a line-cutter.[50] Emerson made the change on this model which is only available to the US Navy and the model designation is the NSAR (Navy Search And Rescue) Knife.[50]



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