Per saperne di più sui cosiddetti "mercenari"
Se ne occupa la Brookings Institution.
Di Peter W. Singer, Warriors for Hire: The Privatized Military in Iraq e Outsourcing the War.
Altre fonti:

Focus on Iraqi Politics,

Privatized Military Firms and International Law,

America, Europe and the Crisis Over Iraq,

The Marines: No Better Friend, No Worse Enemy,

Iraq Index: Reconstruction and Security.