BREEDING

More historically associated with dogs, cats and horses (i.e. domesticants), there were over the last century many attempts to further the species by this more traditional method.
The pitfalls were the same and it must have been challenging and expensive keeping the gene pool big enough to avoid inbreeding pedigree weaknesses.
As was to be expected, most of the experimentation was done on males in the military – it’s practically a tradition now, as we never run out of willing rank and file. Even with cloning as an alternative to naturally occurring humans, the majority created for such tests were inevitably males. If this isn’t chivalry, I’m not sure what is.