Major General Charles A. Willoughby's G-2 (intelligence) section did not agree with the airmen's assessment the islands were unoccupied. Drawing on Ultra and Allied Intelligence Bureau reports from interrogating local civilians, it reported on 15 February that there were 3,000 Japanese troops in the Admiralty Islands. On 24 February, it revised the estimate to 4,000. G-2 attributed the lack of anti-aircraft fire to the Japanese logistical situation, believing it was a measure to conserve ammunition. Lieutenant General Walter Krueger, the commander of US Sixth Army later recalled no one at his headquarters believed the islands unoccupied. In the original plan, a team of Alamo Scouts was to have thoroughly reconnoitred the island before the landing. Krueger had a six-man party of Alamo Scouts inserted on the southern coast of Los Negros by PBY under cover of a bombing raid on 27 February. The scouts reported the south coast was "lousy with Japs".