Arizona Scavenger

Arizona Scavenger is an unmarked quest in Fallout: New Vegas.

Detailed walkthrough
After speaking with Aurelius of Phoenix, he offers the character a bounty on the lives of NCR soldiers. For proof, Aurelius will require NCR dogtags to be brought to him. With a Barter skill of 35, the cap reward can be changed to ammunition and/or supplies. To inquire about the ammunition and/or supplies, you will have to see Decanus Severus. To easily find NCR dogtags, it is best to head to areas with a high NCR population. These areas include Camp McCarran, Camp Forlorn Hope, Camp Golf, Hoover Dam and Mojave Outpost. Locate Aurelius of Phoenix and turn in the dogtags, you will be paid in caps for every dogtag you turn in; if you succeed at the Barter check, Decanus Severus will trade NCR dogtags in varying amounts in exchange for certain items and differing amounts of Legion fame (see bugs).

Weapons: (Note: asking to redeem for weapons immediately removes five dogtags from the player's inventory)
 * 20-25 NCR dogtags -> 9mm SMG, +1 to Legion Fame
 * 25 NCR dogtags -> laser pistol, +1 to Legion Fame
 * 30 (25) NCR dogtags -> 10mm SMG, +1 to Legion Fame
 * 50 NCR dogtags -> Laser rifle, +1 to Legion Fame

Armor: (Note: asking to redeem for armor immediately removes five dogtags from the player's inventory)
 * 15 NCR dogtags -> Leather armor, +1 to Legion Fame
 * 20 NCR dogtags -> Leather armor, reinforced, +1 to Legion Fame

Explosives:
 * 3 NCR dogtags -> Frag grenade or dynamite, +1 to Legion Fame

Ammunition:
 * 1 NCR dogtags -> 10 rounds of .22LR, 9mm, .357, 10mm, 20 gauge, or small energy cells, +1 to Legion Fame

Food:
 * 1 NCR dogtags -> 1 random food item, +1 to Legion Fame
 * 3 NCR dogtags -> 1 random food item, +4 to Legion Fame
 * 5 NCR dogtags -> 1 random food item, +12 to Legion Fame
 * 10 NCR dogtags -> 1 random food item, no Legion Fame

Bugs

 * Many of Severus' rewards for handing in dog tags are coded incorrectly, using the function instead of the  function, and most of those passing the value of the reward to the wrong variable.  This means that several of the expected fame rewards trigger in unexpected amounts that do not match the intended "one tag, one fame point" exchange rate, such as the option to redeem explosives granting only a +1 to fame rather than the intended +3, or all of the weapon and armor exchange options granting only one point of fame.  Conversely, two of the food redemption options grant too much fame, with the three-tag option granting +4 to Legion fame and the five-tag option granting a staggering +12 to Legion fame.  The ten-tag food redemption option grants no fame at all.
 * In addition to the above bugs, Severus' food redemption options do not give out the correct number of food items if the player turns in any more than one tag at a time.
 * Simply asking to trade dogtags for weapons or armor will immediately remove 5 dogtags from the player's inventory, effectively raising the price of all weapon and armor rewards by 5. This can even leave the player in a situation where there are no dialog options available other than "I want to trade for something else" if their dogtag count falls below the minimum necessary for any reward after the 5 are removed.
 * The option to trade for a 9mm submachine gun will become visible if the player has at least 20 NCR dogtags, but if chosen will attempt to remove 25 dogtags from their inventory. Similarly, the option to trade for a 10mm submachine gun becomes visible if the player has at least 30 NCR dogtags, but only removes 25 dogtags if the option is chosen.