This requirement will be a multi-year, multi-task effort to provide the consumers of Department of Defense (DoD) Public Key Infrastructure (PKI) consultation and engineering support. This includes, but is not limited to, custom code development and maintenance, requirements analysis, procurement, Information Assurance analysis related to PKI, facilitation of interoperability with external partners, integration of commercial-off-the-shelf products and services with the DoD PKI, Public Key Engineering consultation and engineering support to Combatant Commands/Services/Agencies and Enterprise Programs, community collaboration, and configuration documentation to support systems on the Non-Classified Protocol Router Network and the Secret Internet Protocol Router Network as well as the associated testing of these systems and their required documentation.