Full disclosure: Never served and regret it.
This said past basic training the job dictates the need.
During Nam when unloading ammo crates from a chopper were some lighter than others?
If your buddy needs to be pulled out of somewhere and he weighs x number of pounds are you going to tell him to drop 50 lbs in weight because you cant pull him out?
Will the Army start producing a lighter body armor for woman? Is a loaded AR with 4-6 mags magically lighter for woman?
If a situation demands something it doesn't matter if you are a man or woman.
The job dictates the need.