The Douglas SBD Dauntless dive bomber became a mainstay of the Navy's air fleet in the Pacific, with the lowest loss ratio of any U.S. carrier-based aircraft. Douglas delivered a total of 5,936 SBD/A-24s between 1940 and the end of production in July 1944. The SBD Dauntless featured "Swiss cheese" flaps — dive brakes punched with 3-inch holes — so that it could achieve pinpoint accuracy by diving to the target, dropping the bomb and then pulling out of the near-vertical dive. In addition to the U.S. Navy, Marine Corps and Army Air Forces, the Dauntless served forces in New Zealand and Mexico. The first enemy ship sunk by the U.S. Navy in World War II is credited to a Dauntless from the USS Enterprise. The diving Dauntless went on to destroy 18 enemy warships, including a battleship and six carriers. The SBD-3, which appeared in March 1941, had O5Os in the cowling. Self-sealing tanks were introduced, as well as protective armor, and the engine was the 1,000hp R-1820-52.
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