Underground market service selling millions of harvested U.S. government and U.S military harvested emails addresses to potential spammers. Cyber criminals are getting more sophisticated in their scams and phishing schemes, which are designed to steal personal data and financial information. Spammers buy lists from brokers that continuously harvest email addresses from newsgroups, chat rooms, web sites, Internet directories, and more. Users whose emails have been exposed are advised to be extra vigilant for potential targeted malware attacks enticing them into downloading and executing a malicious attachment, or attempting to trick them into clicking on a client-side exploits serving link.
Source: https://thehackernews.com/2012/03/cyber-criminals-selling-millions-of-us.html