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UK Forces have the "Big 6" embossed on a circular tag, the Big 6 being:

* Surname
* Initials
* Service Number
* Date of birth
* Blood Group
* Religion

Canadian Forces' dog tags are designed to be broken in two. Each section contains the following information:

* Service Number
* Initials and surname
* Religion and blood group
* The legend "CDN FORCES CDN"

* The second half is identical except it does not contain the blood type

US Armed Forces typically carry two identical oval tags containing:

USAF Format 1:

* Surname, first name, middle initial
* Social Security Number, followed by "AF" indicating branch of service.
* Blood Group
* "blank"
* Religion

USAF Format 2:

* Surname
* First name and middle initial
* Social Security Number, followed by "AF" indicating branch of service.
* Blood Group
* Religion

USMC:

* Surname
* First name, middle initial (sometimes just first and last initial), blood group
* Social Security Number with no dashes, but spaced
* Branch gas mask size
* Religion or medical allergy if red medical tag.

US Navy:

* Surname, first name, middle initial
* "blank"
* Social Security Number with no dashes or spaces followed immediately by branch blood group
* "blank"
* Religion

US Army:

* Surname
* First name, middle initial
* Social Security Number
* Blood group
* Religion

Norwegian dog tags are designed to be broken in two:

* The top half containing the nationality, date of birth, social security number and the bloodtype.
* The bottom half contains the nationality, date of birth, social security number and has a hole so the broken off half can be hung on a ring.