The "dog tag" worn around the neck of PH2 Daniel A. Bernath while he was part of ship's company of the USS Yorktown.  As such, this dog tag was around his neck 24 hours a day from 1968 to 1970 as the Yorktown and Petty Officer Bernath; 

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crossed the Equator, 

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went around the Horn of South America, 

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crossed the International Date Line, 

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went to Hawaii, 

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Japan, 

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Honk Kong, 

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Philippines, 

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Singapore, 

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California, 

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Chili, 

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Brazil, 

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Cuba, 

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Virgin Islands, 

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Denmark, 

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Germany, 

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France, 

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England, 

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Boston, 

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Virginia, 

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Rhode Island  

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and crossed the Artic Circle.

The dog tag says  Bernath D.A. B52 19 02  USN PROT  O
The sailors name, serial number, branch, religion and blood type.  If a sailor was killed in action then the dog tag would identify who the sailor was as "dead men tell no tales."

The lower dog tag was a US Army dog tag, worn by Sgt. Irving E. Bernath in Alaska and throughout Europe during World War Two.  In 20 years the design didn't change much.