What is the meaning of Dog Tag ?

Dog tags are also known as military identification tags.Every American soldier wears a Dog Tag on his or her chest, which is a necessary part of the military service to identify soldiers.It is a set of (two) stainless steel sheets, both 5cm X 3cm, with a long 24-inch stainless steel choker on the main card and a short 4-inch choker on the secondary.Both with black muffler gaskets (though you can request a different color muffler gasket) are a must-have for military enthusiasts.