NCR dogtag

Dog Tags are a miscellaneous item in Fallout: New Vegas. They can be found on the corpses of fallen NCR soldiers much like Holotags could be found on the Brotherhood of Steel in Fallout 3.

An easy place to find these without losing reputation would be on the dead NCR soldiers in the Camp Guardian caves or by pickpocketing any NRC soldiers.

Quartermaster Mayes at Camp Forlorn Hope will accept NCR dog tags. His tent can be found to the right of the Command Tent, he will reward you with 2 caps and NCR reputation per tag, or ammo and supplies when you have barter of 35.

Speaking with Aurelius of Phoenix at Cottonwood Cove gives you the opportunity to turn in dog tags for a reward of 10 caps each.