 Hathcock held the record for the highest bounty ever placed on a Marine, and he killed every Vietnamese sniper who came after him. In one of the most remarkable sniper versus sniper duels in history, Hathcock and his spotter John Roland Burke were stalking the enemy sniper called the Cobra in the jungle near Hill 55. This was a fire base southwest of Da Nang where the Cobra had already killed several Marines to lure Hathcock out to kill him. The stalking lasted for two days. Carlos said,