Not being in the military myself, I know my comments can't be based on experience. But I personally believe they shouldn't be on the frontline. Naturally they're more emotional than men, which could cause some hesitation in combat and they are naturally weaker than men. And I know there's some massive women that would crush a lot of men, but it's easier for a man to be bigger than a woman - they have larger frames. They also have a much higher risk factor if caught by the enemy, I'm talking about rape here. And on the subject of sex, they can cause sexual distraction to the men in the unit. Then we got the subject of "that time of the month" - although that can be solved by "the" pill.
For all second-line duties, and some front-line duties like MT drivers and such then yes, I'm all for women in the military. Men have carried the burden of combat for centuries , but I don't think men and women should serve side by side. Just like you wouldn't have women and men on the same rugby, or ice hockey team ... you shouldn't have men and women in the same battalion, in the same trenches.