Originally published in 1946. This report is a summary of the operations of antiaircraft artillery from December 1941 until August 1945 against the enemy in the Pacific theater. Engagements with aircraft, protection to airfields, supply bases, and ground troops, combat service support, and infantry support in the Philippines, East Indies, Central and Western Pacific, Papua, Guadalcanal, New Guinea, Northern Solomons, and Ryukyus campaigns are covered.