It can hold 14 helicopters. It’s more than 800 feet long. It has a very flat top: It’s Japan’s largest warship since World War II — unveiled on the 68th anniversary of the atomic bombing of Hiroshima. But it’s not a carrier. The destroyer Izumo cost $1.2 billion and goes public amid territorial clashes between China and Japan (China, for its part, appears to be always ready). Japanese officials insist the Aug. 6 unveiling was coincidental and had more to do with favorable ocean tides than World War II history, according to this AFP report. They also insist the ship…