担心战时影响发射速度 美国核弹发射密码曾为8个0
<p><span word="For">For</span> <span word="nearly">nearly</span> 20 <span word="years">years</span>, <span word="the">the</span> <span word="secret">secret</span> <span word="code">code</span> <span word="to">to</span> <span word="authorize">authorize</span> <span word="launching">launching</span> <span word="U">U</span>.<span word="S">S</span>. <span word="nuclear">nuclear</span> <span word="missiles">missiles</span>, <span word="and">and</span> <span word="starting">starting</span> <span word="World">World</span> <span word="War">War</span> <span word="III">III</span>, <span word="was">was</span> <span word="terrifyingly">terrifyingly</span> <span word="simple">simple</span> <span word="and">and</span> <span word="even">even</span> <span word="noted">noted</span> <span word="down">down</span> <span word="on">on</span> <span word="a">a</span> <span word="checklist">checklist</span>.</p><p><span word="The">The</span> <span word="Permissive">Permissive</span> <span word="Action">Action</span> <span word="Link">Link</span> (<span word="PAL">PAL</span>) <span word="is">is</span> <span word="a">a</span> <span word="security">security</span> <span word="device">device</span> <span word="for">for</span> <span word="nuclear">nuclear</span> <span word="weapons">weapons</span> <span word="that">that</span> <span word="it">it</span> <span word="is">is</span> <span word="supposed">supposed</span> <span word="to">to</span> <span word="prevent">prevent</span> <span word="unauthorized">unauthorized</span> <span word="arming">arming</span> <span word="or">or</span> <span word="detonation">detonation</span> <span word="of">of</span> <span word="the">the</span> <span word="nuclear">nuclear</span> <span word="weapon">weapon</span>.</p><p><span word="JFK">JFK</span> <span word="signed">signed</span> <span word="the">the</span> <span word="National">National</span> <span word="Security">Security</span> <span word="Action">Action</span> <span word="Memorandum">Memorandum</span> 160 <span word="in">in</span> 1962 <span word="that">that</span> <span word="required">required</span> <span word="all">all</span> <span word="nuclear">nuclear</span> <span word="missiles">missiles</span> <span word="to">to</span> <span word="be">be</span> <span word="fitted">fitted</span> <span word="with">with</span> <span word="a">a</span> <span word="PAL">PAL</span> <span word="system">system</span>.</p><p><span word="But">But</span> <span word="nuclear">nuclear</span> <span word="experts">experts</span> <span word="claim">claim</span> <span word="the">the</span> <span word="military">military</span> <span word="was">was</span> <span word="worried">worried</span> <span word="about">about</span> <span word="the">the</span> <span word="possibility">possibility</span> <span word="of">of</span> <span word="command">command</span> <span word="centers">centers</span> <span word="or">or</span> <span word="communication">communication</span> <span word="lines">lines</span> <span word="being">being</span> <span word="destroyed">destroyed</span> <span word="in">in</span> <span word="real">real</span> <span word="nuclear">nuclear</span> <span word="war">war</span>, <span word="stopping">stopping</span> <span word="soldiers">soldiers</span> <span word="getting">getting</span> <span word="the">the</span> <span word="codes">codes</span> <span word="or">or</span> <span word="authorization">authorization</span> <span word="to">to</span> <span word="launch">launch</span> <span word="missiles">missiles</span> <span word="when">when</span> <span word="they">they</span> <span word="were">were</span> <span word="actually">actually</span> <span word="needed">needed</span>.</p><p><span word="So">So</span> <span word="they">they</span> <span word="simply">simply</span> <span word="left">left</span> <span word="the">the</span> <span word="security">security</span> <span word="code">code</span> <span word="for">for</span> <span word="the">the</span> <span word="weapons">weapons</span> <span word="as">as</span> <span word="eight">eight</span> <span word="zeros">zeros</span>, <span word="getting">getting</span> <span word="around">around</span> <span word="the">the</span> <span word="security">security</span> <span word="safeguards">safeguards</span>.</p>
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