Lockheed Martin's preliminary design for the Sentinel A4 air defense radar passed muster with the Army this month, clearing the way for the defense contractor to begin drafting designs for the upgraded sensor which a company official said could launch a new line of business -- including foreign sales -- worth as much as $6 billion. Mark Mekker, Lockheed Martin's Army radar programs director, said the A4 Sentinel radar passed the preliminary design review -- a four-day process -- the...
