72590
In the Royal Air Force , a blue-grey field forage cap ( sometimes called the ' chip bag hat ' ) of an identical style remains widely worn with both working dress and flying suits .
 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