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The overuse of heavy canned wet rations reached a ludicrous extreme during the early years of U.S. involvement in the Vietnam war , when American soldiers on extended infantry patrol were forced to stack their canned rations in socks to minimize weight and noise .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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