The Allies chose the Solomon Islands (a protectorate of the United Kingdom), specifically the southern Solomon Islands of Guadalcanal, Tulagi and Florida Island, as the first target, designated Task One (codenamed "Pestilence)," with three specific objectives. Originally, the objectives were the occupation of the Santa Cruz Islands (codenamed "Huddle)," Tulagi (codenamed "Watchtower)," and "adjacent positions". Guadalcanal (code name "Cactus"), which eventually became the focus of the operation, was not even mentioned in the early directive and only later took on the operation-name "Watchtower". Tiny Tulagi had a large natural harbor perfect for a float-plane base and small Florida had to be taken as it dominated Tulagi. Large Guadalcanal, south across the soon-to-be-named Iron Bottom Sound was added when it was discovered the Japanese were building an airbase there.