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After obtaining his commission Rickards served primarily in the 16th Pennsylvania Infantry , including commander of Company F from 1883 to 1888 , and Company D from 1888 to 1891 .
 Pennsylvania Infantry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pennsylvania Infantry