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The interceptors remained until June 1944 , when they were moved out and replaced by Kampfgeschwader 53 ( KG 53 ) , a bomber unit which was moved in from the Eastern Front , flying Heinkel He 111 s , the unit used the bombers to air launch the V-1 flying bomb .
 Kampfgeschwader 53, 53
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kampfgeschwader 53, 53