1155
In a letter [ PDF ] to workers and the California Attorney General 's office , the aerospace contractor said that between April 18 , 2016 and March 29 , 2017 , crooks infiltrated the website , allowing them to access staffers ' W - 2 paperwork for the 2016 tax year .
 ( data breach: access,  W - 2 paperwork: compromised data, infiltrated the website: attack pattern, crooks: attacker, staffers: victim, 2016: time, the aerospace contractor: victim, between April 18 , 2016 and March 29 , 2017: time) 
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: access,  W - 2 paperwork: compromised data, infiltrated the website: attack pattern, crooks: attacker, staffers: victim, 2016: time, the aerospace contractor: victim, between April 18 , 2016 and March 29 , 2017: time) 