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In December 1966 , 1st Battalion , 7th Artillery positioned M101A1 105mm howitzers aboard LCM-6 landing craft , with the intent that the craft be towed to a supported area and moored to a riverbank .
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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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