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The USMC Mark 2 combat knife was a Union Cutlery design modified with suggestions from a couple of Marines, and it was adopted by the Marine Corps on November 23, 1942. Union Cutlery produced the second largest amount of the design for the war out of several companies with contracts (behind Camillus), and their practice of using the KA-BAR stamp led to all of the Mark 2s getting generically called "Ka-Bars". Like all tissues getting called "Kleenex". Union Cutlery changed their name to Ka-Bar after the war to capitalize on the name recognition.