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In 2013 the International Institute for Strategic Studies attributed the force with four paramilitary battalions , 55 AIFV including 44 BMP-1 , and 24 wheeled armoured personnel carriers .
 International Institute for Strategic Studies
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:
 International Institute for Strategic Studies