"On 9 March 1636/7 (ref. Mass. Records 1:188) the General Court ruled that although only freemen (a political term meaning full citizenship individuals) could be elected as officers, all members of the trained band (i.e. those males required to both own weapons and to attend the musters) could vote in the company elections provided that they had taken the oath of loyalty to the General Court known as the "residents' oath."
Most every country with significant armed forces have allowed enlistment by foreigners abroad during wartime, and have for several thousand years.
http://www.history.army.mil/reference/mamil/Mamil.htm
Yes, but they were not intent to overthrow our country.