Unfortunately, I had to have him explain it. Seems that servicemen are provided 2 tags, one to be kept on the large chain, the other on the short chain.
So when a serviceman is killed in combat and has to be left behind, you're supposed to take the Tag on the short chain, and put the other tag in the casualties mouth. Then turn in the short chain tag for accountability.
So by keeping your tags together, you aren't a KIA.
Jen (USAF)