MCO 5239.2B governs Marine Corps cybersecurity policy, procedures, tasks, conditions, and standards implementation guidance for the MCEN.
View MCO 5239.2B on armypubs.army.mil
It delineates organizational actions for securing communications, digital information, systems, and networks, including precautions against cyber attacks. It establishes a comprehensive framework for security governance and controls over information resources and addresses protection of data in transit and at rest on the MCEN.
An Annex providing the policy, procedures, and standards implementation guidance for Marine Corps SCI Networks will be published 180 days from the issuance of this Order. (paragraph 3)
The MCEN is both, the MCEN - NIPRNet (MCEN-N) and the MCEN SIPRNet (MCEN-S); however, this document will refer to both networks as one MCEN. (paragraph 3)
In accordance with references (c) and (d) the Marine Corps will employ a comprehensive cybersecurity program designed to protect and defend the MCEN and the data in transit and the data at rest on the MCEN to ultimately support the commander’s information needs. (paragraph 4)
Operationally, failure to implement the proactive or corrective cybersecurity measures identified in this Order may result in critical information loss, capture, corruption, or lack of timely access which may potentially lead to mission failure. (paragraph 1)