For folks in my age cohort, there has always been the nuclear triad, consisting of manned bombers, submarine launched ballistic missiles, and of course, land based Intercontinental Ballistic Missiles. But it wasn’t really that long ago that the last two legs of the triad were introduced.
Here’s a pretty interesting look at the first operational ICBM system, the SM-65 Atlas.
Of note, the first operational launch sites were not hardened. Also, before inertial guidance was accurate en0ugh for operational use, the very unwieldy radio command guidance was used.
Finally, you’ll notice for the most part the uniforms were simple and functional. Plain green fatigues (and some of them pretty dang faded) or the simple unadorned khakis. Seems to me the services were quite capable of doing big things back then. Maybe we should go back to dressing that way.