Yamamoto's subordinate, the innovative Admiral Shigeyoshi Inoue, commander of the Fourth Fleet ("South Seas Force"), also contributed significantly to altering IGH's plan. He insisted that protecting IJN bases would require that fortified airfields be established is several locations. These included Lae, Salamaua and Port Morseby in New Guinea and Tulagi on Florida Island near Guadalcanal in the southern Solomons. This would permit shuttling Japan's limited number of aircraft from base to base to confront Allied moves as they developed.