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The basic reason the US needed to capture any Pacific island was to put airfields on it from which land-based aircraft could operate and dominate the surrounding area, and to deny the use of the island to the enemy for that same purpose. The Navy had aircraft carriers, but these were very expensive, took several years to build, and could be swiftly sunk by a submarine firing torpedoes, or lost in battle. At the time Pacific islands were sometimes referred to as "unsinkable aircraft carriers". As soon as enough of the island was secured to begin, construction was started on an airfield, and as soon as that was far enough along combat planes began operating from it, to relieve the necessity of the Navy risking its precious carriers in the area of the battle to provide air support. The first island campaign was on Guadalcanal, in the Solomon Islands. This operation had to be launched in a hurry because the Japanese were building an airfield on it, from which, when it was completed, they could interrupt the flow of supply ships from the US to Australia. In the case of Iwo Jima, the Japanese had airfields on Iwo, and the US had massive bomber airfields they had built in the Mariana Islands, from which B-29s flew to bomb the Home Islands of Japan. These B-29s passed close enough to Iwo coming and going that Japanese fighter planes from Iwo could harass the bombers, and also the radio based on Iwo could send an early warning to Japan of an impending raid. Once captured Iwo served as an emergency landing field for B-29s shot up over Japan or experiencing mechanical trouble, aircraft which would have otherwise been forced to ditch in the vast, trackless expanse of the Pacific. Around 700 planes made use of Iwo for emergency landings. Iwo also provided a base for US fighter planes, whch had a shorter operational range than the bombers. From Iwo they could escort the B-29s to Japan and protect them from Japanese fighter attacks. Okinawa was valuable for among other reasons it was a large island, capable of holding many airfields, and was well within range of Japan's Home Islands for land-based aircraft, which could be used to support the eventual invasion of Japan.

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