Three-Card Bounty

 is a quest in Fallout: New Vegas.

Quick walkthrough
Violet, Cook-Cook, and Driver Nephi have been giving Major Dhatri a major problem and he wants their heads on a plate.

Detailed walkthrough
Cook-Cook is easily the closest of the bounties to the airport. To avoid a few unnecessary Fiends you must travel north along the highway near the airport until you reach a few Frag Mines. Take a left turn towards Vault 3 and take out the 5 to 8 standard fiends you may encounter. Finally after or while your taking the fiends near the Brahmin pen Cook-Cook will appear with an Incinerator and a Flamer (Fallout: New Vegas). He'll use the incinerator for long range attacks and the flamer for close, so it's recommended that you simply shoot the incinerator out of his hands then walk backwards and shoot while he tries to get into Flamer range. He utilizes armour so Armor Piercing bullets are recommended. Also remember to NOT aim for the head else your pay will suffer.

You can also talk to Little Buster before setting out after Cook-Cook, who informs you that Cook-Cook has a favorite brahmin named Queenie, and that killing Queenie would incite Cook-Cook to fly into a rage, attacking anyone near him, including Fiends. Snipe Queenie and wait for the fighting to end. Since it will be close contact fighting, Cook-Cook's head should remain intact if he's overtaken by the Fiends, and there will be only a few (low on health) Fiends left for the player to fight.