Hmm, I had looked at the wiki and it didn't seem to say specifcally one way or another, other than stating the the Kyoshi warriors were all female themselves. I did some internet digging and people seem to think that all soldier extra types in the show has been purposefully ambiguous as to gender, and that feamle soldiers did exist, just not in equal proportions to male.

But, if the concensus here is againt it, I've  got no problem tweaking some stuff around to make it fit better.