Lockheed Martin expects an investigation into the A2100 propulsion system carried by four key military space constellations to wrap up in May. The system is resident on Lockheed's GPS III, Space-Based Infrared System, Advanced Extremely High Frequency and Mobile User Objective System satellite constellations. Jeff Smith, vice president of military space at Lockheed, confirmed to Inside Defense this week that the investigation is linked to a July anomaly in which the fifth MUOS satellite did not complete its orbit-raising...