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kennedy entered the navy earning hero status for saving his ship mates when his boat pt - 109 was sunk by the japanese .
 japanese: attacker; boat: target
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 japanese: attacker; boat: target