A "dogtag" is the informal name for the identification tags worn by military personnel, because of their resemblance to actual 'dog' tags. 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. In the event the member has a medical condition that requires special attention, an additional red tag with the pertinent information is issued and worn with the dog tags. Wearing of the tag is required at all times by soldiers in the field. In the U.S., two identical tags are issued. One is worn on a long chain around the neck; the second on a much smaller chain attached to the first chain. In the event the wearer is killed the second tag is collected and the first remains with the body. Cited from Wikipedia article on Dogtags

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