The operation specifies that perimeter security for legacy networks will deny intrusions and data infiltration, that firewalls will be maintained through risk assessment and formal adjudication of legacy application waiver requests, and that legacy networks will be shut down as quickly a possible after enterprise networks (such as the NMCI) are established.
This procedure outlines the steps to secure legacy networks by preventing unauthorized access and data theft, maintaining firewalls through risk assessment and formal approval for exceptions, and decommissioning legacy networks once enterprise networks are operational.