Why are they injecting US Troops with what aim and for what Purposes?

That's for the government to know and for you to never find out. Depleated uranium munitions are not such a good thing to be always exposed to either. I forgot the numbers, but the accumilated amount of depleated uranium rounds fired in Iraq are measured as many times more radiation(like 1,000 X more) than the WW II atomic bombs dropped on Japan.