At the fall of the iron curtain we learned that the system you are nostalgically venerating was so thoroughly and systemically compromised by the soviets as to make those marines little more than little girls wielding daisies. The Roderick James Ramsay conviction is a good example where the breadth and depth of the penetration was so bad that we didn't even try to really get to the bottom of any of it to avoid embarrassment and political fallout.
By way of example, Rod was able to facilitate hardware level duplication (and could have easily performed neutralization though he did not) of the Permissive Action Link nuclear keys in the active german theatre which were also in locked safes on one of the largest US bases in the world behind many, many layers of armed soldiers.