Military Communications
The United States Navy utilized extremely low frequencies (ELFs) as radio band and radio communications. The Submarine Integrated Antena System (SIAS) was a research and development effort to communicate with submerged submarines. The Soviet/Russian Navy also utilized ELFs for submarine communications system, ZEVS.
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“The military mind is indeed a menace. Old-fashioned futurity that sees only men fighting and dying in smoke and fire; hears nothing more civilized than a cannonade; scents nothing but the stink of battle-wounds and blood.”
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