Career Ending Question

In 1973, a US Major Harold I Hering, during a Minuteman Missile Crewman Training asked this question, "How can I know that an order I receive to launch any missile came from a sane President?"

He was duly discharged and became a truck driver.

But his "killer question" has led to many debates on the adequacies of the current authorization procedures of the USA re launching of any nuclear weapon, by the Commander-in-Chief (who is required to make that critical decision within 15 minutes?).

If one of the pioneers of Nuclear weapons and the Cold War has this uncertainty on the "fail-safe"system, how about the other owners of nuclear weapons like Russia, China, UK, India and Pakistan etc. Have they got a better system?