543
`` The key endgame may be whether the U . S . can parse out the key regime centers of power in Baghdad and attack them without having to fight into the city , or at least locate them well enough to at man of the Center for Strategic and International Studies said in his daily war report .
 ( attack: attack,  U . S: attacker, city: place, them: target) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( attack: attack,  U . S: attacker, city: place, them: target) 