This is a misunderstood statistic. 1,000,000 troops have not been wounded. That is the number of troops that served in either Iraq and Afghanistan that have been treated by the VA. You don't have to be wounded to be treated by the VA. If you got hemorrhoids while you were in Iraq because you ate too much steak at the DFAC at whatever base you were at and got that in your service medical record you could seek treatment for the same thing after you are discharged. The vast majority of people being treated at the VA have never seen direct action and were not wounded by the enemy. I'm not taking away from anyone's service, I'm just stating a fact.
Wounded and injury/illness/whatever are not the same thing.