Before the Kiska attack in August 1943, Attu was secured after several weeks of combat in extremely difficult weather. The American troops on Attu were ill-prepared for the cold, stormy environment of the Aleutians, but they were better prepared for the Kiska campaign with heavier clothing and training supplemented by 15–45 days of acclimatization and maneuvers in the Aleutians. Beginning in January, the United States Navy blockaded the island and bombed it almost every day in conjunction with the United States Army Air Forces. Aerial photographs of the area showed enemy vehicles as late as August 13.