@SuperbattleshipYamato In my game, I took the island without a fight with 1 transport loaded with infantries because the Japanese player evacuated the garrison earlier in the game to reinforce China. My opponent sank my transport with air but was too busy to recapture the island.
If the island is garrisoned, a transport loaded with a tank and an infantry could do the job but that kind of battle could get dicey. To send more stuff seems to me like it’s too much money spent to invade a low income and strategically placed island like Iwo Jima.