The Army completed a critical design review of Lockheed Martin's Sentinel A4 radar system in February, five months ahead of schedule, the company announced April 1. "It feels good to have those five months, but we want to deliver early, we're not looking to use that five months anywhere else," Mark Mekker, Lockheed's director of Army radar programs, told Inside Defense in an interview. "The warfighter needs them. There are threats out there now that need to be addressed,...