Following World War II, the US Navy Department, (in 1959) adopted the dog tags used by the US Army and Air Force, so a single shape and size became the American standard.
The same pattern was worn into the Second World War and the Korean War by Commonwealth forces. 204, dated December 20, 1906, which essentially prescribes the Kennedy identification tag: "An aluminum identification tag, the size of a silver half dollar and of suitable thickness, stamped with the name, rank, company, regiment, or corps of the wearer, will be worn by each officer and enlisted man of the Army whenever the field kit is worn, the tag to be suspended from the neck, underneath the clothing, by a cord or thong passed through a small hole in the tab.
Our son is due to be deployed before the end of the month.
His dog tag does not have the correct blood type on it.
There is a recurring myth about the notch situated in one end of the dog tags issued to United States Army personnel during World War II.
It was rumored that the notch's purpose was so that if a soldier found one of his comrades on the battlefield, he could take one tag to the commanding officer and stick the other between the teeth of the soldier to ensure that the tag would remain with the body and be identified.