I bet it's all random, but 70% of all my soldiers are female (I even have a all women squad - the amazons
).
However, all scientists, doctors and workers are male, which is odd, considering the fact that most special forces hardly ever take women soldiers, but women are quite common among scientists, medics and so on. An other remark is that the scientist model looks to much like doctor Evil, sharing the same model with the doctors. Scientists should look different. I'm not saying they should look like Einstein, but they could have a different outfit.
Almost every soldier is either caucasian or asian, and all have English names. It's odd to see that Africa gave me 5 soldiers and all are caucasian. Where are the african soldiers?
The names are pretty repetitive - I have 3 Clintons (all women, but not Hilary) and 4 Crawfords (no Cindy yet).