Weapons Storage and Security System (WS3) is a system including electronic controls and vaults built into the floors of Protective Aircraft Shelters (PAS) on several NATOmilitary airfields all over the world. These vaults are used for safe special weapons storage, typically of tactical B61 nuclear bombs. Historically the system was also called within NATO the Weapon Security and Survivability System (WS3)[1][2] or Weapons Survivability and Security System.[3]
^Deputy Assistant to the Secretary of Defense, Nuclear Matters, Nuclear Chronology, Department of Defense, archived from the original on 2009-01-09, retrieved 2008-06-11