Borne by carriers of the fleet of Admiral Marc Mitscher, Navy aircraft conduct a series of raids on Truk (now Chuuk, Federated States of Micronesia), a major Japanese naval installation in the western Pacific. One raid was the first nighttime bombing mission by the Navy. Japanese losses from the raids are heavy; 275 aircraft, 10 ships and 31 merchant ships. Ship tonnage lost – 200,000 tons – was the highest in the war for a single action.