https://committees.parliament.uk/publications/22344/documents/165210/default/
https://publications.parliament.uk/pa/ld201719/ldselect/ldintrel/53/53.pdf
https://www.brookings.edu/blog/order-from-chaos/2021/03/30/the-us-military-must-plan-for-encounters-with-private-military-companies/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=118778216&utm_source=hs_email
https://www.gmfus.org/sites/default/files/2022-02/Keil%20-%20NATO%20core%20tasks%20-%20brief%20NEW.pdf