This document provides an overview and guidance for implementing the Department of Defense Information Assurance Certification and Accreditation Process (DIACAP) within the Department of the Navy (DON). It defines DON roles and responsibilities, outlines the five DIACAP activities, and describes the documentation required for certification and accreditation. The goal is to establish a standardized, risk-based process for authorizing the operation of DON information systems and maintaining security throughout their lifecycles.