
https://www.bmvg.de/resource/blob/5636374/38287252c5442b786ac5d0036ebb237b/nationale-sicherheitsstrategie-data.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://rusi.org/explore-our-research/publications/commentary/why-did-afghan-army-evaporate