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Ecuador
Practice Relating to Rule 8. Definition of Military Objectives
Section E. Lines and means of communication
Ecuador’s Naval Manual (1989) considers communications and command and control (C3) facilities, as well as “lines of communication and other objects used to conduct or support military operations”, as proper targets for naval attack. 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 8.1.1.