66729
In the Royal Air Force , it is worn with service working dress ( No. 2 dress ) either covering the top of the trousers ( or skirt ) and the lower part of the shirt or through the belt loops if they have been specially designed to accommodate the belt 's width .
 Royal Air Force
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:
 Royal Air Force