The Air Force and Lockheed Martin are close to completing a review of the A2100 propulsion system, which is used to power three major Air Force satellite constellations. Service officials confirmed Nov. 3 the service and Lockheed have completed the review for the GPS and Space-Based Infrared System programs. The service's Advanced Extremely High Frequency satellite program also carries the system, and officials are currently completing "some final actions" before wrapping up that review, according to Col. Dennis Bythewood, head...