Lieutenant Colonel Donald M. Weller, USMC, served as the FMFPAC/Task Force 51 naval gunfire officer, and no one in either sea service knew the business more thoroughly. Weller had absorbed the lessons of the Pacific War well, especially those of the conspicuous failures at Tarawa. The issue, he argued forcibly to Admiral Turner, was not the weight of shells nor their caliber but rather time. Destruction of heavily fortified enemy targets took deliberate, pinpoint firing from close ranges, assessed and adjusted by aerial observers. Iwo Jima’s 700 “hard” targets would require time to knock out, a lot of time. Neither Spruance nor Turner had time to give, for strategic, tactical, and logistical reasons. Three days of firing by Admiral Blandy’s sizeable bombardment force would deliver four times the amount of shells Tarawa received, and one and a half times that delivered against larger Saipan. It would have to do. [Illustration: JAPANESE DEFENSE SECTORS] In effect, Iwo’s notorious foul weather, the imperviousness of many of the Japanese fortifications, and other distractions dissipated even the three days’ bombardment. “We got about thirteen hours’ worth of fire support during the thirty-four hours of available daylight,” complained Brigadier General William W. Rogers, chief of staff to General Schmidt. The Americans received an unexpected bonus when General Kuribayashi committed his only known tactical error during the battle. This occurred on D-minus-2, as a force of 100 Navy and Marine underwater demolition team (UDT) frogmen bravely approached the eastern beaches escorted by a dozen LCI landing craft firing their guns and rockets. Kuribayashi evidently believed this to be the main landing and authorized the coastal batteries to open fire. The exchange was hot and heavy, with the LCIs getting the worst of it, but U.S. battleships and cruisers hurried in to blast the casemate guns suddenly revealed on the slopes of Suribachi and along the rock quarry on the right flank. That night, gravely concerned about the hundreds of Japanese targets still untouched by two days of firing, Admiral Blandy conducted a “council of war” on board his flagship. At Weller’s suggestion, Blandy junked the original plan and directed his gunships to concentrate exclusively on the beach areas. This was done with considerable effect on D-minus-1 and D-day morning itself. Kuribayashi noted that most of the positions the Imperial Navy insisted on building along the beach approaches had in fact been destroyed, as he had predicted. Yet his main defensive belts criss-crossing the Motoyama Plateau remained intact. “I pray for a heroic fight,” he told his staff.