YOKOSUKA, Japan - When the submarine USS Ohio surfaced at sea and Machinist Mate 1st Class Jason Witty emerged from the hatch to look around, he saw calm, blue water under a peaceful sky — perfect for the solemn task he was about to perform. On the map, the Ohio was afloat in just another indistinguishable expanse of the Pacific Ocean. As Witty stood on deck holding a silver pitcher, the vessel was alone. Just like the ill-fated USS Indianapolis, 63 years earlier.