Boeing Defense, Space & Security (BDS) formerly known as Boeing Integrated Defense Systems (IDS) is a unit of The Boeing Company responsible for defense and aerospace products and services. Boeing Integrated Defense Systems was formed in 2002 by combining the former "Military Aircraft and Missile Systems" and "Space and Communications" divisions. Boeing Defense, Space & Security makes Boeing the second-largest defense contractor in the world and was responsible for 45% of the company's income in 2011. BDS is based outside St. Louis, Missouri. Boeing was the largest employer in St. Louis County in 2000.