Geclassificeerde informatie: verschil tussen versies

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==Externe links ==
* [https://www.dss.mil/portal/ShowBinary/BEA%20Repository/new_dss_internet/isp/odaa/nispom06.html US "NISPOM" manual]{{dode link|datum=september 2017 |bot=InternetArchiveBot }}, explaining rules on classified information among other things - full title is "National Industrial Security Program Operating Manual"
* [http://www.archives.gov/isoo/training/marking-booklet.pdf Marking Classified National Security Information] ISOO booklet [[Portable Document Format|PDF]]
* [http://www.mod.uk/DefenceInternet/AboutDefence/WhatWeDo/SecurityandIntelligence/DVA/DefenceVettingAgency.htm Defence Vetting Agency]. Carries out national security checks in the UK
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