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The fort served as the headquarters of the 8th Cavalry in the early 1870 s and as the headquarters of the 9th Cavalry in the late 1870 s during the Apache Wars .
 8th Cavalry, 9th Cavalry, Apache Wars
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 8th Cavalry, 9th Cavalry, Apache Wars