The military is able to "profile" for certain categories that require background updates and remove access to information and position. They do so for excess debt, drug use, AFFILIATION with particular groups.
If I remember the group listing accurately, certain religious groups were on the restricted listing. Adherence to any wahhabi Islamic sect should require loss of access.
Good point, but how do you do a complete background check on someone who has only been in the U.S. for two years and spent the first 20 in Lahore, Pakistan (like one guy I recently served with)? Answer: You can't.