I have seen him wearing it a bunch of times--it looks like it might have something hanging inside of it? Does anyone know more about it or know from whence it came?

I've wondered about this as well. I haven't noticed that cross lately and I can't remember when he wore the dogtags the last time. I hope someone can figure out where it came from.

I've wondered/asked about this too... I never heard anything

I've never really seen a close up of it...it reminds me of an open locket.