A restricted line officer is a designator given to a United States Navy and Navy Reserve line officer who is not eligible for Command at Sea. There are many different types and communities, including Engineering Duty Officers, Aerospace Engineering Duty Officers, Aerospace Maintenance Duty Officers, Naval Intelligence Officers, Cryptologic Warfare Officers, Information Operations Officers, Foreign Area Officers, Public Affairs Officers, Naval Oceanographers, Information Professionals, and Human Resources. Engineering Duty Officers EDOs apply technical expertise, practical engineering judgment, and business acumen to the research, development, design, acquisition, construction, life cycle maintenance, modernization, and disposal of ships and submarines and their associated warfare support systems. EDOs work in Fleet Maintenance & Industrial Management (50%), Acquisition (20%), and Systems Engineering (30%). Aerospace Engineering Duty Officers AEDOs provide professional management and technical direction in the entire air weapon system acquisition process from design to production and later product improvements of Naval aircraft and weapons. Over one-third of AEDO billets are flying billets. AEDOs test and evaluate new aircraft, weapons systems, and weapons in various stages of development. Throughout a career, the AEDO will have billets primarily in NAVAIR in: (1) operational support activities; (2) headquarters; (3) research, development, test, and evaluation; and (4) manufacturing and production. All active duty AEDOs and most Navy Reserve AEDOs are accessed from the Unrestricted Line and have previously qualified and been designated as Naval Aviators or Naval Flight Officers. Aerospace Maintenance Duty Officers AMDOs provide full-time direction in the development, establishment, and implementation of maintenance and material management policies and procedures for the support of naval aircraft, airborne weapons, attendant systems and related support equipment. The community includes approximately 500 officers. In addition to working in fleet maintenance organizations throughout the fleet, AMDOs are involved in all aspects of material acquisition and support as top-level Program Managers in NAVAIR and as Commanding Officers of the Naval Aviation Depots. AMDOs and AEDOs are combined into a new, single competitive category at the Captain level. Naval Intelligence Naval Intelligence provides tactical, operational and strategic intelligence support to U.S. naval forces, joint services, multi-national forces, and executive level decision-makers. Naval Intelligence Officers have a wide variety of technical and non-technical academic backgrounds, including political science, modern history, physical and natural sciences, and the liberal arts (which include languages and linguistics). There are approximately 1,350 Naval Intelligence Officers. Cryptologic Warfare Formerly known as Naval Information Warfare Officers, there are over 800 Navy