Department of Defense and Pentagon is disclosing news of the one of the largest data loss events to date. From investigation, officials to believe the intrusion was orchestrated by a foreign government. The theft of around 24,000 sensitive Pentagon documents occurred in March 2011. The most skilled hacking attempts are coming from nation states, rather than hacking groups, he warned. The loss is an example of why the Pentagon has developed new cyber security rules that emphasize deeper defenses, more collaboration with private industry and new steps to stop thefts by malicious insiders.
Source: https://thehackernews.com/2011/07/pentagon-admits-to-biggest-ever-data.html