It was part of USAFFE's Harbor Defenses of Manila and Subic Bays, under the Philippine Coast Artillery Command. The 60th was to provide air defense over Manila Bay and the southern tip of the Bataan Peninsula, and was equipped with 3-inch guns (an older model with a vertical range of 8,200 m), 37mm Guns, .50-caliber machine guns, and Sperry searchlights. A battery, with a platoon of searchlights, was located at Fort Wint, in Subic Bay. Following the Attack on Pearl Harbor on 7 December of that year, the Japanese invaded the Philippines. The regiment served in the Battle of Bataan and the Battle of Corregidor, and surrendered to the Japanese at the end of the latter on 6 May 1942. However, the 60th was not officially inactivated until 2 April 1946.