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Unmanned science and technology: a new boost to coastal defense islands and border defense.Unmanned technology: coastal defense, islands and frontier defense's new help to defend the motherland.Unmanned science and technology: a new boost to coastal defense islands and border defense.

Unmanned science and technology: a new boost to coastal defense islands and border defense.3. Efficient logistics support needsUnmanned technology: coastal defense, islands and frontier defense's new help to defend the motherland.