SAN DIEGO -- The Navy's aircraft carriers will rely on other technologies to defend against torpedoes after determining its $700 million Surface Ship Torpedo Defense system is not worth pursuing any further, according to the Navy's acquisition executive. The director of operational test and evaluation revealed in his fiscal year 2018 report -- released Jan. 31 -- that the Navy had suspended research and development on the SSTD system and intends to strip it from aircraft carriers. That system's R&D...