AvP 2010 hadn't playable female marines because, if I remember right, Reb said that they use different skeleton and animations model and they were pushed by SEGA to release the game so there was no time to implement those into the multiplayer. I am willing to believe them because I know how greedy SEGA are, and we can see from 10000 miles that AvP 2010 was rushed, because of SEGA ofc, not because of Reb.