 Between 1939 and late 1940s squadrons of ground attack and bomber units equipped with the Breda Ba-65Bis ("Esquadrilha Independente de Aviões de Assalto") and converted-Junkers Ju 52/3m ("Grupo de Bombardeamento de Dia" and "Grupo de Bombardeamento de Noite") were based at Sintra Air Base.The base later became home to the Basic Flight Training Group (, GIBP), with Basic Flight Training Squadron No.1 (, E.I.P.B.