The squadron was established in October 1942 as the 519th Bombardment Squadron, a heavy bombardment squadron that was one of the four squadrons assigned to the 377th Bombardment Group. The following month the squadron's name was changed to the 14th Antisubmarine Squadron reflecting its mission to patrol the coastline and offshore waters for enemy submarines. The squadron was initially equipped with light observation aircraft. Before the end of the year it was assigned North American B-25 Mitchells. At the end of the year, the 377th Group was inactivated and the squadron was assigned directly to the 25th Antisubmarine Wing, which was responsible for anti-submarine operations off the Atlantic coast of the United States.