 The 121st OS, which had also been flying observation flights as part of the "Carolina Maneuvers", began antisubmarine patrols over the Atlantic coast using O-47s and L-4 Grasshoppers.The 96th Air Base Squadron was initially assigned as the base host unit for ground support squadrons, being replaced by the 19th Air Base Group in February 1942.The antisubmarine patrol mission was reassigned to Charleston AAF which was much better suited for it, as Charleston was located right on the Atlantic coast.