386257
The project was cancelled due to changes in market requirements that also lead to the development and production of the smaller but similar Rolls-Royce Spey , and the cancellation of the Armstrong Whitworth AW .681 military transport aircraft project .
 Rolls-Royce
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rolls-Royce