The first post-war, twin-engine flying boat to be developed by the U. S. Navy will be the Martin P5M-1, an initial production contract having been awarded to The Glenn L. Martin Company. The order was revealed today in a joint announcement by the Department of Defense and C. C. Pearson, president of the Martin Company. The Martin P5M-1 is primarily intended for anti-submarine warfare operations anywhere in the world, but also will serve as a cargo or general utility carrier. The P5M-1 will succe