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UK example reference: https://www.theregister.co.uk/2019/12/20/uk_conservatives_br...
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EU example reference: https://www.theverge.com/2020/2/24/21150918/european-commiss...
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US example drafted by NSA: https://media.defense.gov/2020/Apr/24/2002288652/-1/-1/0/CSI...
* Note this document is for public release. If you dig around you will find references to deploy US Special Forces even using Signal for official communications within combat zones.
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