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Nuclear weapon design
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===Permissive action link=== {{See also|Permissive action link}} A ''permissive action link'' is an [[access control]] device designed to prevent unauthorised use of nuclear weapons. Early PALs were simple electromechanical switches and have evolved into complex arming systems that include integrated yield control options, lockout devices and anti-tamper devices.{{Citation needed|date=April 2024}}
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