= Permissive action link
{wiki=Permissive_action_link}
A Permissive Action Link (PAL) is a security feature designed to prevent unauthorized use of nuclear weapons. It acts as a form of electronic lock that restricts the ability to arm or launch a nuclear weapon unless the correct codes or authorizations are provided. PAL systems are integrated into the design of nuclear weapons and may involve various technologies, including: 1. **Mechanical Keying**: Physical keys or mechanisms that need to be set to allow the weapon to be armed.
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