Dive bombers. The Curtiss SB2C Helldiver dive bomber introduced in 1942 was faster than the Dauntless but regarded as difficult to handle. Making necessary improvements delayed its first use in combat until late 1943. By this time, the Allies were moving away from an aircraft type dedicated to dive bombing. Air-to-ground rockets had been introduced that offered accuracy that formerly had been the primary advantage of the dive bomber over level bombers. Such rockets could be fired from the other types of carrier aircraft and were ultimately carried by Hellcat fighters, Corsair fighter-bombers, and Avenger and Swordfish torpedo bombers as well as Helldiver dive bombers. Nonetheless, the Helldiver became widely used and participated in battles over the Marianas, Philippines, Formosa, Iwo Jima, and Okinawa and sank more tonnage of Japanese shipping than any other aircraft during the war. It shared credit with Avengers for sinking IJN "Yamato".