This later became the site of a United States Marine Corps Air Base, where he was persuaded to interact with the Americans and teach them the art of Jujutsu.
In November 1959, Robertshaw became the Assistant Wing Commander, 1st Marine Aircraft Wing at Marine Corps Air Station Iwakuni, Japan.
Since 2000, the base has killed approximately 25,000 Black Widow spiders which apparently came to the base in cargo and luggage of Americans assigned to the base.
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