[1] The joint exercise involved a National Security Agency red team which played the role of North Korea, Iran, and Cuba attempting to cause critical civilian infrastructural damage, as well as gain control over the military's command-and-control capabilities.
The first two phases were concerned with computer network penetration of civilian infrastructure and military command and control.
[3] Recently declassified documents show that the last phase of Eligible Receiver connected cyber attacks to operations in physical domains.
[1] Specifically, the mock attack included a hijacking-at-sea of the ship MV National Pride.
Documents detailing the last phase of Eligible Receiver remained classified until they were obtained through a Freedom of Information Act request by the nongovernmental National Security Archives at George Washington University.