A committee of operations analysts who advised the Joint Chiefs of Staff and the Twentieth Air Force on targets recommended Superfortress attacks on coke ovens and steel factories in Manchuria and Kyūshū. Shutting down these key industries would severely cripple the enemy's war effort. Also on the target list were important enemy harbor facilities and aircraft factories. Wolfe launched the first B–29 Superfortress combat mission on June 5, 1944, against Japanese railroad facilities at Bangkok, Thailand, about away. Of the 98 bombers that took off from India, 77 hit their targets, dropping 368 tons of bombs. Encouraged by the results, XX Bomber Command prepared for the first raids against Japan.