The original JFK space program was aircraft style access to space and the last building block on that segment never made it any further than the SR-71 in 1964. I know, my grandfather was a short list guy.
Their goal was to achieve 25,000 KMPH, which is escape velocity in the stratosphere. Let me tell you where I get my insight on this:
My grandmother on my mother's side: Senior statistician on the X-15, worlds first variable thrust rocket.
My great uncle Jack (Radar Man) on my father's side: CIA SR, OXCART was compartmentalized within CIA SR, AQM-60 Kingfisher, A-12, U2, YF-12A/B, SR-71, D-21 and more.
My grandfather on my father's side, JFK space program short list, 33rd degree Scottish rite freemason, the one that was lost and why none of the other short list guys would come forward on JFK's space program.
In 1992 I met my great uncle Jack, he lived on Warpath Ln in north woods Wisconsin, throughout my upbringing I had been told only that he was OSS when it became CIA in 1947 and in that year was present on a particularly famous New Mexico gig. While staying at his place as my family was vacationing and had travelled across the country to see other relatives, I was told by my father that my uncle wanted to tell me something. We entered into his office and my father proceeded to tell him that he had told me nothing. My great Uncle stated that "It is okay, they have already retracted DET1", my great uncle then proceeds to tell my father to leave the room. He then stated to me that, "Strategic Reconnaissance was my baby, and it had to be cancelled not because they cut funding, but because of the way they did it and that involved your grandfather. I am %99.9 certain that those people killed Kennedy". From what I understand the JFK shooters were discovered to have met in the Cal-Neva on north shore Tahoe. I was a bit taken back by this as I had just been told my family was involved in building the prototype of my favorite aircraft and when I exited the room my father had been seated and with his fingers in his ears. He took notice to me and then stated that "You have been read in". He later clarified to me that DET1 was detachment 1 based out of Okinawa. During our stay our there we had some small talk about it as he seemingly did not think I had absorbed what he had told me. He stated at another point that the SR-71 was a building block to my grandfather and on another occasion while in his truck coming back from town told me that "he had gotten my grandfather killed", not intentionally but he seemed to carry guilt over it. I asked him "did they steal anything?" and he mentioned the image sensors mentioned a figure in the millions of dollars range and I said "well, there you go". From what I can put together on it my grandfather was on fund raiser for Children's Hospital in Reno, NV and had asked to wire money secretly and was directed to north shore Tahoe. He wired the money and was involved in a fatal plane crash that killed both my grandparents in 1964 and the money sent never made it as the USAF had to purchase the image sensors and this is what was considered to be a breach of a program run in absolute secrecy. All of this happened prior to my being born in 1967 and I was never told anything about it really other than bits and pieces here and there and was raised in south Tahoe and my father never knew what I had confirmed to me by my great uncle as he was sent out of the room. Two years ago I lost my father and noted circumstances very questionable and incidents are related through a setup on a court case and some Sherriff's getting burned over accusations of women being raped in the county jail that were present in the hospital in Reno the day we had to unplug my father from life support after having a stroke. Needless to say the gloves came off, I am back up here in Tahoe and I brought hell with me.
So my insight into it tells me the JFK space program never went any further than what was developed in 1964 because the short list guys for the space program would not come forward and appear to have been building much cooler stuff than what we saw with the space shuttle, Being the US doesn't really have a space program anymore I'd say the way things went was certainly the for the worse.