The Navy “E” Ribbon denotes the wearer was on permanent duty aboard a U.S. Navy ship or in a unit that won a battle efficiency competition after July 1, 1974. United States Marine Corps members assigned as ship’s company are eligible on the same basis as Navy personnel; Marine Corps (and other sister-Service) personnel assigned to embarked units, such as aircraft squadrons, battalion landing teams, and Marine Expeditionary Units (MEU) are not eligible to wear the ribbon.