Which massive data breach led to the creation of the Federal Cybersecurity Enhancement Act of 2015?

Test your knowledge about one of the most significant cybersecurity events affecting U.S. government operations. This breach fundamentally changed how federal agencies approach digital security, leading to extensive reforms in government information systems protection policies. The aftermath sparked major legislation and executive orders to strengthen the nation's cyber defenses. How well do you know this pivotal moment in government cybersecurity history?

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Office of Personnel Management (OPM) breach, exposing 21.5 million government employees' personal data
State Department email system breach by Russian hackers
Pentagon contractor breach exposing military personnel records
USPS data breach affecting 800,000 employee records