"The final phase of the Pacific naval war commenced with the assault on Iwo Jima in February 1945, closely followed by that on Okinawa in April. These two positions were inner defenses of Japan itself; their capture by United States forces meant that the heart of the Empire would from then on be exposed to the full fury of attack, not only by our carrier aircraft but also by land-based planes, the latter in a strength comparable to that which wreaked such devastation against the better protected and less vulnerable cities of Germany. After Okinawa was in our hands, the Japanese were in a desperate situation, which could only be alleviated if they could strike a counterblow, either by damaging our fleet or by driving us from our advanced island positions. The inability of the Japanese to do either was strong evidence of their increasing impotence and indicated that the end could not be long delayed."