The Kennedy administration seriously considered a first strike nuclear attack on the Soviet Union.
I believe most of the strategic nuclar TRIAD was put together during JFK's administration. 600 B-52's, 41 SSBN missile subs and 1,000 ICBMs.
Walt
JFK and Johnson campaigned on the "missile gap". Most of the TRIAD was already in place or in the pipeline.
Had he not died the way he did, he'd just be a footnote.