If you are eligible to adjust status in the US you would receive a work permit and with that you should be eligible to enlist.
If you entered the US illegally, no matter what age, and no one else petitioned for you prior to April 30, 2001 then you cannot adjust status.
Having DACA status may allow you to adjust status in the US. To be certain please contact my officer for a free consultation.
Answered on Feb 10th, 2016 at 4:11 PM