 Some VNSAs are organized as paramilitary groups, adopting methods and structure similar to those of state armed forces.Others may be informally structured and use violence in other ways, such as kidnapping, using improvised explosive devices, or hacking into computer system.Thomas, Kiser, and Casebeer asserted in 2005 that "VNSA play a prominent, often destabilizing role in nearly every humanitarian and political crisis faced by the international community".