Combine any two military style dog tags on one chain. Dog tags presented back-to-back in classic military style. Most people choose a sober birthday tag with either a Serenity Prayer or AA Unity Symbol,AA Slogans, Clean or Sober Birthday Year, or NA Symbol.& 3rd Step Prayer; Or, make up your own combo with any two dog tags of your choice.-- even two of the same style! Authentic military style dog tag necklaces are sure to please even men who don't wear jewelry. They are very casual and suitable for men or women. My own original design, crafted in my studio using a marking technique that is permanent and will never, peel, rub off or fade. Backs of dog tag are customizable.