You could probably say serving on the front lines is disastrous for anyone's body, be it male or female. I don't think this makes a particularly strong argument one way or another.
However I don't believe that women should be serving on the front lines in combat unless they have absolutely no choice, the homeland has been invaded, and they are working to defend their home/family while in their home country.
For example if the Chinese decided to invade the USA with lots of ground troops I may be forced to shoot or otherwise kill some of these foreign soldiers to defend myself, my family, etc. but I wouldn't go to China if the situation was reversed.