"Also, you're assuming that ALL females are physically weaker then ALL males. Which is not the case. If a woman is apt and able, why shouldn't she serve?"
Yes. ALL. In caps. Is exactly what everyone means.
Unless of course frontline fighting squads are chosen from a specific grouping of physically fit rather than just all men. After all, the marines wouldn't turn away toddlers, the elderly, the disabled, the overweight, the underweight, and the brittle boned.....
Oh wait.... actually looking at it, all you're really saying is that the top 5% of physically fit men fall outside the range of virtually all women. Unless of course all they mean is that it's not worthwhile testing women to see if they're capable, when it will give a force of 45K people, an extra 2k recruits at best. (Taking Vietnam as an example, and scaling down for population difference).
So! Is it worthwhile? Well lets take one example of physical strength (a frontline fighter still needs about 100lbs of gear, as well as a need to be a good shot and whatnot).
Men's weightlifting record: 263.5 Clean and Jerk.
Women's: 186Kg Clean and Jerk.
A female olympian recordholding weightlifter, the best ever, is losing by about 170lbs.
Well... men are naturally bigger, so lets adjust for weight category.
You get out of the heavyweights, and start looking at smaller men.
Men still take the record even if you don't count any men over the top weight class for women, and keep going until you're 20 pounds lighter than the heaviest woman. Men would still be winning for strength.
It's only when you're looking at men almost 30 pounds lighter that they start to compare to the *best* woman. (You're looking at weightlifters weighing 135 pounds and under competing with a >165lb woman).
Similar stats can be looked at for:
Aggression. Speed. Stamina. Pain Threshold.
Women come out on top for:
Dexterity. Visual acuity. Multitasking. Flexibility.
This is why there are twice as many women in the airforce as any other branch of the military (almost 20% compared to figures of 7%(marines) to 14%(navy) elsewhere).
So. Frontline fighters, changing the military machine, separating accommodation, incidence of rape in the military, mistreatment of women by enemy forces, over-coddling of women by current forces, retraining required for sensitivity on the one hand, and lack of sensitivity on the other, all that jazz, for the benefit of, if done fairly (with equal requirements for both men and women), an extra (being generous) 5%?
My conclusion? No.
However: I say let them take all the same tests as the men, and if they pass them all, and enough pass them all that it is worth investing in any changes required to accommodate them, I take it all back.