56946
According to Gen. Tran Van Tra , the [ North Vietnamese ] " Party concluded , the " United States was forced to introduce its own troops because it was losing the war .
 Tran Van Tra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tran Van Tra