I think it was a great idea by Lemay. The old theory that "the bombers always get through" was disproved in Europe in a major way. But by the time Lemay removed most defensive guns from the B-29s (March 9, 45), the B-29s had P-51 escorts to and from their missions versus Japan( as of April, 45). Those P 51s had to fly from Iwo Jima, though, which was a long, tough trip for single engine fighters. But that changed in June, 45, when Okinawa was captured and used as a forward air base.The pluses outweighed the minuses