Editing Dead man's switch (section)

===Altimeter switches===
[[Strategic Air Command]] developed a dead man's switch for its nuclear bombers, known as [[Special Weapons Emergency Separation System]] (SWESS), that ensured the nuclear payload detonated in the event of the crew becoming incapacitated through enemy action. The purpose of this device, unlike other examples mentioned above, was [[fail-deadly]] rather than [[fail-safe]]. Once armed, the system would detonate the onboard nuclear weapons if the aircraft dropped below a predetermined level,<ref>{{cite book|title=The Limits of Safety|first=Scott Douglas|last=Sagan|url=https://books.google.com/books?id=9eE9DwAAQBAJ&q=SWESS&pg=PA187|isbn=0-691-02101-5|publisher=Princeton University Press|year=1995|access-date=2008-11-16|pages=187–188}}</ref> typically due to being shot down.