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.

Quartermaster Mayes at Camp Forlorn Hope will accept NCR dog tags. His tent can be found to the right of the Command Tent.

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