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In page Washington SyCip:

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After learning of his father's imprisonment in the Philippines by Japanese invading forces, he reevaluated his plans of pursuing a doctorate degree. In 1942, he enlisted himself in the US Army[1] and became a naturalized US citizen in 1943[2]. He joined Camp Cooke but was told to be "overqualified" for the infantry for having the highest IQ level in his regiment. He studied Japanese in a language school in Colorado and cryptography in Virginia. He was then deployed to Calcutta, British India as a codebreaker.[1]