Sea lines of communication, the primary maritime routes between ports, used for trade, logistics and naval forces
Black Sea | Mediterranean Sea | Baltic Sea | North Sea | Red Sea | Caspian Sea | Caribbean Sea | Adriatic Sea | Delta Air Lines | Aegean Sea | South China Sea | Greyhound Lines | Sea of Japan | Irish Sea | Westland Sea King | Dead Sea | Arabian Sea | Tyrrhenian Sea | Southend-on-Sea | East China Sea | Communication | Ionian Sea | Eastern Air Lines | communication | Outside the Lines | Bering Sea | White Sea | Kara Sea | First Sea Lord | Manly-Warringah Sea Eagles |
In 1942, the success of German submarines against Allied shipping and the shortage of escorts with which to protect Allied sea lines of communication convinced U.S. President Franklin D. Roosevelt of a need to engage mercantile shipbuilders in the construction of warships for escort duty.