 The Southwest Pacific was not a promising theater of war for the strategic bomber. The bombers of the day did not have the range to reach Japan from Australia, and there were no typical strategic targets in the theater other than a few oil refineries. Thus, "The air mission was to interdict Japan's sea supply lanes and enable the ground forces to conduct an island-hopping strategy." This set up a doctrinal clash between Kenney, an attack aviator, and Walker, the bomber advocate. The long-standing Air Corps tactic for attacking shipping called for large formations of high-altitude bombers. With sufficient mass, so the theory went, bombers could bracket any ship with walls of bombs, and do so from above the effective range of the ship's anti-aircraft fire. However the theoretical mass required was two orders of magnitude greater than what was available in the Southwest Pacific. A dozen or so bombers was the most that could be put together, owing to the small number of aircraft in the theater and the difficulties of keeping them serviceable. The results were therefore generally ineffective, and operations incurred heavy casualties.
