Mutual Assured Destruction (MAD) - Second-Strike Capability : https://en.wikipedia.org/wiki/Mutual_assured_destruction#Sec...
>Perfect detection
No false positives (errors) in the equipment and/or procedures that must identify a launch by the other side.
The implication of this is that an accident could lead to a full nuclear exchange.
During the Cold War there were several instances of false positives, as in the case of Stanislav Petrov[2].
[2] Stanislav Petrov : https://en.wikipedia.org/wiki/Stanislav_Petrov
[2] 1983 Soviet Nuclear False Alarm Incident : https://en.wikipedia.org/wiki/1983_Soviet_nuclear_false_alar...