The USS Samuel Rayburn SSBN-635 entered the world quietly, as most serious things do, laid down in December 1962 while the Cuban Missile Crisis was still a fresh bruise on the national psyche. The men who authorized her construction did not need speeches or slogans to understand what they were building. They were responding to a moment when the margin for error had narrowed to the width of a human heartbeat. Submarines like Rayburn were conceived as insurance policies written in steel and uranium, meant never to be cashed, only to exist. She was commissioned on December 2, 1964 at Newport News, carrying the name of a Texas congressman who believed deeply in institutional endurance and disliked theatrical gestures. It was an oddly fitting namesake for a boat designed to remain unseen, unheard, and uncelebrated while doing the most consequential job imaginable.