President Donald Trump's push to reshape the U.S. Navy's newest aircraft carriers is drawing warnings from defense analysts, contractors and former officials who say the proposed changes could increase costs, delay construction and reverse design decisions the Navy spent years implementing.The concerns come after Trump signed a national security memorandum on Thursday directing the Pentagon and Navy to develop a plan within 60 days to replace the Electromagnetic Aircraft Launch System (EMALS) and Advanced Weapons Elevators on the USS Doris Miller, an upcoming Ford-class aircraft carrier, with steam catapults and hydraulic systems.The Ford class is the Navy's newest generation of...