217679
The squadron , re-designated the 639th Aero Service Squadron in France , was credited with honorable service from January to November , 1918 , but as a construction and support unit , it saw no real combat action .
 Squadron
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Squadron