Naval gunfire support got mixed reviews. While the Marines were enthusiastic about the response from destroyers in the lagoon, they were critical of the extent and accuracy of the preliminary bombardment, especially when it was terminated so prematurely on D-Day. In Major Ryan’s evaluation, the significant shortcoming in Operation Galvanic “lay in overestimating the damage that could be inflicted on a heavily defended position by an intense but limited naval bombardment, and by not sending in the assault forces soon enough after the shelling.” Major Schoettel, recalling the pounding his battalion had received from emplacements within the seawall, recommended direct fire against the face of the beach by 40mm guns from close-in destroyers. The hasty, saturation fires, deemed sufficient by planners in view of the requirement for strategic surprise, proved essentially useless. Amphibious assaults against fortified atolls would most of all need sustained, deliberate, aimed fire. While no one questioned the bravery of the aviators who supported the Betio assault, many questioned whether they were armed and trained adequately for such a difficult target. The need for closer integration of all supporting arms was evident. Communications throughout the Betio assault were awful. Only the ingenuity of a few radio operators and the bravery of individual runners kept the assault reasonably coherent. The Marines needed waterproof radios. The Navy needed a dedicated amphibious command ship, not a major combatant whose big guns would knock out the radio nets with each salvo. Such command ships, the AGCs, began to appear during the Marshalls campaign. Other revisions to amphibious doctrine were immediately indicated. The nature and priority of unloading supplies should henceforth become the call of the tactical commander ashore, not the amphibious task force commander. Betio showed the critical need for underwater swimmers who could stealthily assess and report reef, beach, and surf conditions to the task force before the landing. This concept, first envisioned by amphibious warfare prophet Major Earl “Pete” Ellis in the 1920s, came quickly to fruition. Admiral Turner had a fledgling Underwater Demolition Team on hand for the Marshalls. The Marines believed that, with proper combined arms training, the new medium tanks would be valuable assets. Future tank training would emphasize integrated tank, infantry, engineer, and artillery operations. Tank-infantry communications needed immediate improvement. Most casualties among tank commanders at Betio resulted from the individuals having to dismount from their vehicles to talk with the infantry in the open.