Which single weapon system do you think had the greatest effect on the course of the war? Most go for the atomic bomb, but to me, that was to finish off a still fighting but defeated enemy. For me, it's the Douglas SBD Dauntless dive bomber of Midway. In the span of a few minutes, 4 irreplaceable fleet carriers were destroyed and dealt a blow to imperial Japan that could not recover from. This isn't about the best weapon system but about the use of a particular weapon system that had actually changed the course of the war. Opinions?