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The Americans decided best defense against Kamikazes was to knock them out on the ground, or else in the air long before they approached the fleet. The Navy called for more fighters, and more warning, which meant combat air patrols circling the big ships, more radar picket ships (which themselves became prime targets), and more attacks on airbases and gasoline supplies. Japan suspended Kamikaze attacks in May 1945, because it was now hoarding gasoline and hiding planes in preparation for new suicide attacks if the Allies dared to invade their home islands. The Kamikaze strategy allowed the use of untrained pilots and obsolete planes, and since evasive maneuvering was dropped and there was no return trip, the scarce gasoline reserves could be stretched further. Since pilots guided their airplane like a guided missile all the way to the target, the proportion of hits was much higher than in ordinary bombing. Japan's industry was manufacturing 1,500 new planes a month in 1945. However, the quality of construction was very poor, and many new planes crashed during training or before reaching targets. Expecting increased resistance, including far more Kamikaze attacks once the main islands of Japan were invaded, the U.S. high command rethought its strategy and used atomic bombs to end the war, hoping it would make a costly invasion unnecessary