The United States is relying heavily on private firms to supply a wide variety of services in Iraq, including security. From the information available in published sources, this apparently is the first time that the United States has depended on contractors to provide such extensive security in a hostile environment, although it has previously contracted for more limited security services in Afghanistan, Bosnia, and elsewhere. In Iraq, private firms known as Private Security Companies (PSC) are currently providing security services such as the protection of individuals, non-military transport convoys, buildings and other economic infrastructure, as well as the training of Iraqi police and military personnel. By providing security for reconstruction and stabilisation efforts, private contractors contribute an essential service to U.S. and international efforts to bring peace to Iraq, according to many analysts and policymakers. Nonetheless, the use of armed contractors raises several concerns, including transparency and accountability.