Brotherhood of Steel holotag (Fallout: New Vegas)

Brotherhood of Steel holotags are a miscellaneous item

Gameplay
Every member of the Brotherhood of Steel, just like the soldiers of the U.S. Army that they are descended from, wears a set of two holotags around their neck. They contain essential personal and medical information about the wearer so that their corpse can be identified.

Locations
In Fallout: New Vegas, these holotags appear but are not part of any quest. They may be found on the corpses of any member of the Mojave Chapter of the Brotherhood of Steel. Having them opens up a dialogue option that allows access to their bunker.