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Scot Christenson, director of communications for the US Naval Institute and author of the new book "Dogs in the Navy," spoke to Business Insider about the longstanding canine tradition.
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Sea dogs date back thousands of years
Blackout the dog wears a custom life jacket during World War II.U.S. Naval Institute
Some dogs were specifically bred to be helpful on the water
"Butch" O'Brien, mascot of the U.S.S. Bon Homme wears his life jacket during drill practice in the Sea of Japan in October 1952.Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images
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Dogs have been part of the US Navy since its inception
Officers of the USS Orion pose with the ship's mascot in 1920.U.S. Naval Institute
But it wasn't until World War II that dogs became official Navy members
A member of the US Coast Guard holds onto a sentry dog.U.S. Naval Institute
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The canines received payment for their hard work
A ship captain shakes hands (paws) with the boat's mascot in 1942.WATFORD/Mirrorpix/Mirrorpix via Getty Images
But every once in a while, Navy dogs would get themselves into trouble
US sailors sit with a small dog.CORBIS/Corbis via Getty Images
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Captains had final say over how many dogs could be on board
Scrappy the dog, of the USS Yorktown, poses with a service member.National Archives
Dogs often served alongside cats on Navy ships
Hoy the dog, and Smokey the cat, pose for a photo with a Royal Navy minesweeper.A. R. Tanner/Fox Photos/Hulton Archive/Getty Images
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Dogs were a friend to everyone on board
Sailor Edward Hutton of the US Navy holds his pet puppy 'Swabby', wearing a life preserver made by the crew, ahead of the D-Day invasion in 1944.Imperial War Museums via Getty Images
The fates of many World War II Navy dogs remain largely unknown
Sinbad, of the USCGC Campbell, poses for a wartime photo in 1944.U.S. Naval Institute
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Many dogs still serve in the military today
Butch stands guard over an exhausted Marine on Iwo Jima.U.S. Naval Institute