 Sugar cane, mining, fishing and tropical agriculture became the major industries.In World War II, Japanese-held Yap was one of the islands bypassed in the U.S. "Leapfrogging" strategy, although it was regularly bombed by U.S. ships and aircraft, and Yap-based Japanese bombers did some damage in return.The Japanese garrison comprised 4,423 Imperial Japanese Army men under the command of Colonel Daihachi Itoh and 1,494 Imperial Japanese Navy men.