Lockheed Martin takes flight in times of crisis. A leading global military contractor, the company serves the civil and commercial sectors, but it is firmly on the defense/government side of the aerospace industry; sales to the US government accounts for about 80% of revenue, with the US DoD accounting for some 60%. Aeronautics makes combat aircraft and UAVs, while other segments include Space Systems (satellites and space travel), Missiles & Fire Control (air and missile defense systems), and Mission Systems & Training (ship and submarine combat technology). The company traces its historical roots back to 1912.