 On 16 and 17 February, the US Pacific Fleet's Task Force 58 attacked the main Japanese base at Truk.Most Japanese aircraft were recalled to defend Truk and 19 February saw the last significant interception of Allied aircraft over Rabaul.Meanwhile, on 13 February, General MacArthur had issued orders for the invasion of the Admiralty Islands, codenamed Operation Brewer, which was now scheduled for 1 April.