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Permissive action link
Videos
A permissive action link is an access control security device for nuclear weapons. Its purpose is to prevent unauthorized arming or detonation of a nuclear weapon. The United States federal government
UC1583 PAL controller (early 1990s), based on a commercial Compaq LTE laptop
UC1583 PAL controller (early 1990s), based on a commercial Compaq LTE laptop
National Security Action Memorandum 160: introduction of PAL to all U.S. nuclear weapons under NATO command
National Security Action Memorandum 160: introduction of PAL to all U.S. nuclear weapons under NATO command
A B-61 bomb contains 5,919 parts, including its PAL
A B-61 bomb contains 5,919 parts, including its PAL
Simulated Peacekeeper missile launch (with a house key shown, rather than an actual missile system key)
Simulated Peacekeeper missile launch (with a house key shown, rather than an actual missile system key)
B61 nuclear bomb
Videos
The B61 nuclear bomb is the primary thermonuclear gravity bomb in the United States Enduring Stockpile following the end of the Cold War. It is a low-to-intermediate yield strategic and tactical nucle
Permissive action link
…until these were completely replaced. Over the years the permissive action links have been continuously maintained and upgraded. In 2002, PALs on older B61 nuclear bombs were replaced and upgraded with new systems to improve reliability and security, as a part of extending the weapons' service lives to at least 2025…
B61 training unit intended for ground crew. It accurately replicates the shape and size of a "live" B61 (together with its safety/arming mechanisms) b
B61 training unit intended for ground crew. It accurately replicates the shape and size of a "live" B61 (together with its safety/arming mechanisms) but contains only inert materials
A B61 bomb undergoing disassembly.
A B61 bomb undergoing disassembly.
Inert training version of a B61 in an underground Weapons Storage and Security System (WS3) vault at Volkel Air Base, Netherlands. An access panel on
Inert training version of a B61 in an underground Weapons Storage and Security System (WS3) vault at Volkel Air Base, Netherlands. An access panel on the warhead is open, showing the interface for actions such as PAL (safety/arming) and variable yield setting