But when World War One started they became weapons. Pilots could spy on enemy ... navy in the world but enemy submarines, called U-boats, were destroying ships. So a microphone was invented ...

Fearing China will deploy hypersonic weapons to sink ships in the Pacific, the U.S. Navy is moving forward with a plan to arm ...

But when World War One started they became weapons. Pilots could spy on enemy ... navy in the world but enemy submarines, called U-boats, were destroying ships. So a microphone was invented ...