Not a good idea—Its OK when we are winning and fighting 3rd rate nations—but what happens in a real war—and we lose battles and have lots of our people in POW camps? What happens when we send out our air force and only half come back? Or we see video of our carriers rolling over and going down with a thousand sailors with it? Think of Bataan— What would have happened if half of the US troops were women? Our foes have openly said they would sell our female POWs as sex slaves. Not a good idea to experiment with such things.
Think of the motivational speech an enemy commander can give his troops knowing we fights with women soldiers. Not to mention the extra benefits the enemy gets by winning a battle. To the victory goes the spoils.