On August 22, 1942, Brazil declared war on Germany and Italy. Brazil then became eligible for military assistance from the Allies. As part of this assistance, the Forca Aerea Brasileira (FAB) received 28 A-28As from the USA. These were assigned to the Grupo de Patrulha, based at the 12o Corpo de Base Aerea at Geleao, Rio de Janeiro. On the morning of July 31, 1943, one of these aircraft caught the submarine U-199 on the surface and forced it to remain on the surface where it was later sunk by a Catalina from the same unit.
In 1945, the FAB A-28As were assigned the serial numbers 6028 to 6055. Aircraft 6042, 6051, and 6053 were later modified as transports under the FAB designation C-28, and were reserialed 2900 to 2902 respectively.