The squadron arrived at Kharagpur in mid-April. Once all elements of the 468th Group had arrived at Kharagpur in June, the squadron became part of Twentieth Air Force, which reported directly to Headquarters, Army Air Forces, bypassing theater command. Its initial missions were transporting supplies and equipment to staging airfields in China, and it did not fly its first combat mission until 5 June, when it participated in a raid on railroad repair facilities near Bangkok, Thailand. Ten days later, it participated in the first attack on the Japanese Home Islands since the Doolittle Raid two years earlier. Attacks on Japan required staging through forward bases in China, and squadron bombers consumed twelve gallons of fuel to transport one gallon that could be used for combat missions. The squadron moved its available aircraft to its forward base at Pengshan Airfield near Chengtu. Staging of B-29s, already armed and loaded with bombs began on 13 June and was only completed on the day of the raid, with only refueling needed in China. The primary target for this mission was the Imperial Steel Works at Yawata.