42544
During the 2011 Tōhoku earthquake and tsunami , the base was flooded with seawater , and eighteen F-2Bs belonging to 21st Squadron , as well as other aircraft , were damaged or destroyed .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None