What can be worn on an Army dog tag chain?

Okay, so I've gotten away with keeping my house keys on my dog tag chain for quite some time until an expection. My platoon sergeant needs me to find the regulation. 670-1 only states a long chain and a short chain. Nothing about an Army values tag or anything else that is allowed worn. I do realize that a... show more Okay, so I've gotten away with keeping my house keys on my dog tag chain for quite some time until an expection. My platoon sergeant needs me to find the regulation. 670-1 only states a long chain and a short chain. Nothing about an Army values tag or anything else that is allowed worn. I do realize that a religious symbol may be worn, but I need to find the regulation.
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