“The military has a ;don’t ask, don’t tell' policy pertaining to extremism. If individuals can perform satisfactorily, without making their extremist opinions overt. . . they are likely to be able to complete their contracts. US Department of Defense report, 2005, 'Screening for Potential Terrorists in the Enlisted Military Accessions Process,' Defense Personnel Security Research Center, April 2005, p. 12; http://www.fas.org/irp/eprint/screening.pdf.