On June 4, 2015, the Office of Personnel Management announced that personally identifiable information for 4 million current and retired U.S. Government employees had been breached. China was suspected of having facilitated the breach.
Two weeks later, after the number of data breach victims had risen to 14 million, the National Institute of Standards and Technology (NIST) published its new Guidelines for Protecting Controlled Unclassified Information in Nonfederal Information Systems and Organizations, NIST Special Publication 800-171.