What is a Steel Yard OTH?
a big, currently unused radar
a secret military base
crater after detonating a nuclear bomb
organization of secret Russian agents
Duga (Russian: Дуга) was a Soviet over-the-horizon (OTH) radar system used as part of the Soviet missile defense early-warning radar network. The system operated from July 1976 to December 1989. ... NATO military intelligence had already given it the reporting name STEEL WORK or STEEL YARD.
reach: rather globalCold Warmilitary
Answers by country
a big, currently unused radar
a secret military base
crater after detonating a nuclear bomb
organization of secret Russian agents
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Germany
28
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2062
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35
the United States
28
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16