WASHINGTON -- Ten years ago, as I prepared to take part in the invasion of Iraq, I never thought women would be allowed to serve in combat jobs in the U.S. military, at least not in my lifetime. I wasn't even sure it was a good idea.Some of my male comrades in the 101st Airborne Division (Air Assault) had even clearer thoughts on the question. They told me, sometimes to my face, that I didn't belong in the military at all, much less in a combat zone.Then we crossed the berm into Iraq and drove into Baghdad. Suddenly, my skills as an Arabic linguist were more important than my gender: On combat foot patrols with infantry troops, my ability to help accomplish the mission was what mattered.During major combat operations, the fact that I was a woman was only meaningful if my presence made it easier for the guys to interact with local women. Some Iraqi women were prevented by custom or religion from talking to men; others were terrified of huge soldiers strapped in military gear suddenly appearing at their door.The presence of another woman sometimes calmed them and gave them the comfort level to tell us about threats in their neighborhood.After I returned home, I started to question my earlier doubts. I became convinced that although the older generation of military leaders may not have been prepared to see women attain full equality in uniform, the troops I served alongside would be ready once they moved into leadership positions.They would have seen women medics, helicopter pilots and food specialists serve in combat.Women like Monica Lin Brown, an Army medic who was awarded the Silver Star for her combat valor in Afghanistan; Tammy Duckworth, a helicopter pilot who lost both her legs because of injuries suffered in combat in Iraq; and Shoshana Johnson, a food service specialist who became the first African-American female POW when her unit was ambushed in Iraq.The men and women I served with saw that Americans did not rise up in protest when more than 150 female U.S. service members gave their lives in Iraq and Afghanistan. Rather, the public accepted that women who chose to volunteer for military service did so knowing the risks and grieved for them just as they did for the men who made the ultimate sacrifice.Those who served in Iraq and Afghanistan came to understand that in complex counterinsurgency operations, especially in Muslim nations, the presence of women troops is a vital way to interact with the civilian population -- so important, in fact, that military leaders have long been skirting the old regulations by placing women in combat units.With the repeal of the combat ban on women soldiers, policy will finally catch up to the reality that many of us who have served in Iraq and Afghanistan already know.It is a tremendous step forward. The fact that the final push has come from within the military speaks volumes for how vital women have become to operational success.Much work remains to be done to implement this landmark reform. The U.S. military services (particularly the Army and Marines) may argue that some jobs, particularly in the Special Forces, should remain closed to women. But as women continue to prove their abilities in a growing number of positions, those exclusions will become harder to justify.Secretary of Defense Leon Panetta is acknowledging that to maintain the high standards of the military, assignments should be based on ability, not gender.Kayla Williams is a former sergeant and Arabic linguist in a Military Intelligence company of the 101st Airborne Division (Air Assault). She is also the author of "Love My Rifle More Than You: Young and Female in the U.S. Army."