3121
In the late spring of 1945 , on Salisbury Plain north of RAF Andover , he slalomed a plane between telegraph poles " to prove it could be done " - earning himself a serious reprimand .
 Salisbury Plain, RAF Andover
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Salisbury Plain, RAF Andover