Arizona Scavenger

 is a free quest in Fallout: New Vegas.

Quick walkthrough
After speaking with Aurelius of Phoenix at Cottonwood Cove HQ, he can offer the player character a cap bounty for NCR troops that are killed. For proof NCR Dog tags are to be brought in.

With a Barter skill of 35, the money reward can be changed for ammo and supplies. For that, go to Decanus Severus. For the locations of dogtags, head over to locations with heavy NCR presence.