In World War II more expansion and reorganization occurred. The Japanese invasion of the Philippines resulted in the surrender of US forces there on 9 April and 6 May 1942, including the 59th CA (HD), 60th CA (AA), 200th CA (AA), 515th CA (AA), 91st CA (HD) (PS), and 92nd CA (TD) (PS). The anti-aircraft regiments were broken up into battalions in 1943-44 and the harbor defense regiments were similarly broken up in late 1944, as part of an Army-wide reorganization that left only the Infantry branch as regiments. The "coast artillery" nomenclature was dropped from the antiaircraft units' designations at this time. As a result of this reorganization (in most cases), 46 anti-aircraft artillery (AAA) brigades, 155 AAA groups, and 13 coast artillery groups were activated, probably controlling task-organized groups of battalions. Over 900 battalions were created with the following designations: