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August Operation Camden was an Australian Army military operation in support of the 501 Land Clearing Company , United States Army Corps of Engineers who were undertaking land clearing operations in the Hat Dich Area .
 Australian Army, United States Army Corps of Engineers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Australian Army, United States Army Corps of Engineers