Centurion is right, but, I can't help but feel there's some tradition to having these. Maybe wrapped around the ankle instead of the neck so when a Nepleslian's still standing power armor boots are found, they don't have to run a DNA test.
My own opinion is that it's safe to assume that dog tags are in use by Nepleslia, and most likely the type with stamped metal plate with rubberized edges to prevent clinking. I don't think it needs an article to define the info that's stamped on them be honest. That stuff will be brought up at the speed of plot. The exception would be if it's some sort of high-tech dog-tag with a data-chip in it or something. Even then, I think this is pretty low priority, so assuming Luca gives the green light for the simple ones, simply adding it into the standard issue would do just fine.
I can picture it now - a Nepleslian's remains being nothing but his power armor boots and the contents within, with the upper edges of the shin guards being nothing but molten metal and black carbon.
And, maybe the dog tags.