Do you have an authority?
Two years ago Mexicans were reported to make up 8.7% of the U.S. Military.
http://www.informationclearinghouse.info/article3326.htm
center for immigration studies says 4-5% for all nationalities
http://www.cis.org/articles/2003/markoped042203.html
As most people didn't know until a month ago, the military welcomes enlistment of non-citizens; more than 37,000 lawful permanent residents (green-card holders) serve in the military, where they account for about three percent of active-duty personnel.