The organization:
(a) Implements a managed interface for each external telecommunication service;
(b) Establishes a traffic flow policy for each managed interface;
(c) Protects the confidentiality and integrity of the information being transmitted across each interface;
(d) Documents each exception to the traffic flow policy with a supporting mission/business need and duration of that need; and
(e) Reviews exceptions to the traffic flow policy [Assignment: organization-defined frequency] and removes exceptions that are no longer supported by an explicit mission/business need.
e. every 180 days
Source:
DoD RMF TAG