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Missile launch facility
A missile launch facility, also known as an underground missile silo, launch facility—LF or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs).
The structures typically have the missile some distance below ground, protected by a large "blast door" on top. They are usually connected, physically and/or electronically, to a missile launch control center.
==History==
Until the 1960s ICBMs had been launched from surface bases. The Soviet Union used completely above-ground launchers similar to those found at a spaceport. In many cases they were the same ones used for civilian launches, such as Site 1 and Site 31. They were vulnerable to bomber attacks by the United States.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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