The Defense Threat Reduction Agency (or DTRA) is an agency within the United States Department of Defense (DoD) created "to safeguard America and its interests from threats of mass destruction (chemical, biological, radiological, nuclear, and high explosives) by reducing the threat and providing quality tools and services." DTRA's main functions were threat reduction, threat control, combat support, and technology development. The agency was headquartered in Fort Belvoir, Virginia until the Zombie Outbreak of 2010. DTRA formerly employed 2,000 civilian and military personnel at more than 14 locations around the world, including Russia, Kazakhstan, Azerbaijan, Uzbekistan, Georgia, and Ukraine.