5. Are non-U.S. citizens eligible for a personnel security clearance?
No. However, under rare circumstances, a non-U.S. citizen may be issued a Limited Access Authorization for access to classified information. Specific criteria and limitations are provided in the NISPOM. You may also contact your IS Rep for additional information.
http://www.dss.mil/psmo-i/ps_faqs.html#5
5. Are non-U.S. citizens eligible for a personnel security clearance? No. However, under rare circumstances, a non-U.S. citizen may be issued a Limited Access Authorization for access to classified information. Specific criteria and limitations are provided in the NISPOM. You may also contact your IS Rep for additional information.