Jorge R. Frank wrote:

And it's a good thing they didn't; they *thought* they had the
technology but they didn't. There is no ****ing way that Apollo-era
life support systems would have sustained a crew to Mars and back,
plus they grossly underestimated the total radiation dose (Apollo got
lucky with the timing of solar flares, pure and simple.)

Well, they did have that solar storm watch keeping an eye on on unstable
areas of the Sun as they came into view from Earth.
If a walloping big area of sunspots and flares came into view as they
were readying a Apollo mission I'm sure they would have delayed it till
the next favorable launch geometry presented itself.
And any sort of long-term stay on the Moon is going to inevitably have a
crew up there someday when a solar storm hits.

Pat