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The EMU was created by the integration of a contingent of Royal Australian Navy ( RAN ) aviation personnel ( known as the RAN Helicopter Flight Vietnam or RANHFV ) into the United States Army 's 135th Assault Helicopter Company .
 Royal Australian Navy, RAN, RAN, Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Australian Navy, RAN, RAN, Vietnam