The Navy last year braced for the prospect that faulty welding on a key Columbia-class submarine subsystem could devour 15 of the 23 months reserved for potential schedule delays in building the first missile tubes, but eventually crafted a "recovery" plan that aims to limit delays to 10 months -- a course that keeps construction plans for the new weapon system on track. Naval Sea Systems Command spokesman Alan Baribeau said the remedial plan -- prepared in response to defective...