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The formation of a riverine task force ( composed of 2d Brigade of the 9th Infantry Division and the U.S. Navy River Assault Flotilla 1 ) increased the importance of artillery support in riverine areas , and fixed locations near river areas proved unsatisfactory .
 9th Infantry Division
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 9th Infantry Division