 Ultimately this plan was rejected, but had an element of prophecy, for in September 1944, during World War II, a modified B-24 flying as a drone attacked the submarine installations at Heligoland.Not only was Earle's recommendation rejected, but the Navy declared that though development of the system was to continue, no production resources were to be diverted to it, and it was not to go into production.When the N-9 flight test program got started, it became apparent that a more efficient airframe was needed.