Always/Never: How US Nuclear Weapons Became Safer — Part 1

Strongly recommended in nuclear-accident and weapons-history threads as an excellent documentary on how nuclear weapons were made safe and secure.

Part one of Sandia National Labs' first-person documentary on the use control, detonation safety and survivability of US nuclear weapons. It covers nuclear sharing in NATO and how control of use was separated from possession, leading to the always/never problem.