The next operation was MacArthur's Operation Cartwheel, an advance on the major Japanese base at Rabaul. The Australian Army was tasked with the capture of the Huon Peninsula. Blamey was ordered to again assume personal command of New Guinea Force. His concept, which he developed with Herring and Frank Berryman, who had replaced Vasey as DCGS, was to draw the Japanese forces away from Lae with a demonstration against Salamaua, and then capture Lae with a double envelopment. Blamey remained a devotee of new technology. His plan called for the use of the landing craft of the 2nd Engineer Special Brigade, and he intended to cross the Markham River with the aid of paratroops. Supplies would be brought across the river using DUKWs, a relatively new invention. He also attempted to acquire helicopters, but met resistance from the RAAF, and they were never delivered. MacArthur accepted a number of changes that Blamey made to his strategy, probably the most notable of which was putting the landing on New Britain before Blamey's attack on Madang.