First off, let me just say that women should not be excluded simply because of their gender. Give them the chance if they really want it.
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Having said that, it's my opinion that majority of women don't belong in combat situations. Back in 1994, I went through basic training with the first group of army soldiers that trained men and women together. I've seen first hand how hard it is for women to compete with men in the military. I completely support women's rights, but I believe it is unrealistic to ignore such things as the differences in physical strength between men and women. In combat situations, there are times when you may have to rely on your fellow soldier to do something physical, such as drag your *** out of the line of fire after being wounded.
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Lastly, there have been women soldiers in other countries that have truly been effective killers and contributed a great deal to their military's efforts. Usually, this has been in situations where these women have suffered great hardship in a war torn country, and pushed to the point of desperation to survive. I don't really believe most American women can reach this state of mind, having never been pushed to their limits by the enemy.