ノルマンディー上陸後のアメリカ軍っていうか連合軍は、このC-47みたいに飛行機で空から電信のワイヤを投下して、それを地上で接続して通信線を伸ばしていったんだって。
During the major ground campaign in Europe from June 1944 to May 1945, Allied forces laid an estimated 2 million miles of communication wire. A significant portion of it was dispensed from C-47 aircraft flying low over the battlefield as ground units advanced.
This remains one of the more unusual solutions developed to maintain communications during rapid advances.