Dude ah, use your brain to think can, even for guys, not
everyone can be a medic, let alone not freak out when attending to
soldiers in a real war enviroment (i.e. casulties coming in with no
legs, no arms, intestines all spill out, etc ,etc). 
If even a guy cannot stomach this, you think the female can ah? you
think the female population all can tahan see pool of blood
spilling out of a dying soldier and not faint ah. 
By point is, not every guy is suitable to be medics, similarly, not
every woman can be a nurse.
However, I do see the possibilities of the female population doing
NS in the armed forces or CDF or SPF in the near future if our
birth rate keeps dwindling.