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From 1918 - 1921 , he served in the Red Army during the Russian civil war , first as a signalman and later rising to the rank of inspector of a Special Commission concerning the numbers of the Red Army and Fleet ( Russian : Особая комиссия по вопросам численности Красной Армии и Флота ) of the Field Staff of the Supreme Military Soviet of the Republic ( Полевой штаб Реввоенсовета Республики ) [ 1 ] .
 Red Army
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Red Army