Bungie are generally pretty good at making women look equally as hard ass as men are with their armour.
Take the female armour in Reach, for example. It was the exact same as the male armour, minus the fact its proportions, which were changed to fit the female model.
Then you have the female marines in all of the Halo games, same story there.
And before you say it, CORTANA DOESN'T COUNT >:[
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They did fine up until the ass. I've never seen someone with so much junk in the trunk.