Counter-Strike: Global Offensive
28 days 21 hours
11 days 6 hours
Company of Heroes 2
Grand Theft Auto V
9 days 9 hours
Women did fight in World War 1. Granted it was not common, but the Russians fielded battalions of all-female soldiers.
Other nations have stories of female soldiers, too, albeit generally one-offs. Considering the liberties BF1 takes with history, I don't think adding a few more women soldiers is out the question.
russians aren't in the game