UPDATE 1-F-35 chief cites "good, bad and ugly" about No. 1 U.S. arms program

WASHINGTON, March 23 (Reuters) - Lockheed Martin Corp's $391 billion F-35 stealth fighter jet program has made steady improvements in cost, schedule and technical performance over the past year, but still faces delays in software development and a complex computer-based logistics system, Pentagon officials said on Wednesday.











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