Although the Pentagon has had wartime authority to recruit immigrants since shortly after the Sept. 11 attacks, military officials have moved cautiously to lay the legal groundwork for the temporary immigrant program to avoid controversy within the ranks and among veterans over the prospect of large numbers of immigrants in the armed forces.
A preliminary Pentagon announcement of the program last year drew a stream of angry comments from officers and veterans on Military.com, a Web site they frequent.<<< .......
http://usmilitary.about.com/od/theorderlyroom/a/citizenship.htm
I worked with a medical assistant - one of the best I’ve ever worked with - who had been an Army medic. His parents brought him to the US when he was a child, he went through school south of San Antonio and joined the Army from high school.
When he got out after a full tour and service in Afghanistan, he applied for citizenship.