2244
An unsecured backup drive has exposed thousands of US Air Force documents , including highly sensitive personnel files on senior and high - ranking officers .
 ( data breach: has exposed,  US Air Force documents: compromised data, An unsecured backup drive: victim, sensitive personnel files: compromised data, senior and high - ranking officers: victim) 
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: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: has exposed,  US Air Force documents: compromised data, An unsecured backup drive: victim, sensitive personnel files: compromised data, senior and high - ranking officers: victim) 