A dog tag is the informal name for the identification tags worn by military personnel, because of their resemblance to actual "dog tags":[https://en.wikipedia.org/wiki/Pet_tag]. The tag is primarily used for the identification of dead and wounded along with providing essential basic medical information for the treatment of the latter such as blood type and history of inoculations. 

They are also used as fashion accessories.

h4. External links

* "Wikipedia: Dog tags":[https://en.wikipedia.org/wiki/Dog_tags]
認識票 军人身份确认牌 인식표