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He passed out from RAF Digby in 1924 and was posted to No. 29 Fighter Squadron , equipped with Snipes and later with Gloster Grebe s. After six months he was transferred to the single-seater flight at Martlesham Heath , where he helped to test , among other types , the Gloster Gamecock , Bristol Bulldog , Hawker Hornbill and Avro Avenger .
 RAF, No. 29 Fighter Squadron, Martlesham Heath, Avro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 RAF, No. 29 Fighter Squadron, Martlesham Heath, Avro