[1] https://en.wikipedia.org/wiki/Helium_production_in_the_Unite...
The main source for Helium-3 which is the one we are in shortage of was and is the US nuclear weapons program primarily through the decay of tritium.
https://www.fas.org/sgp/crs/misc/R41419.pdf
https://en.wikipedia.org/wiki/Tritium#Helium-3_and_tritium
[1] https://en.wikipedia.org/wiki/Helium_production_in_the_Unite...