Unlike the Vietnam War, Portugal's limited national resources did not allow for widespread use of the helicopter. Only those troops involved in coups de main attacks (called "golpe de mão" in Portuguese) – mainly Commandos and Paratroopers – would deploy by helicopter. Most deployments were either on foot or in vehicles (Berliet and Unimog trucks). The helicopters were reserved for support (in a gunship role) or medical evacuation (MEDEVAC). The Alouette III was the most widely used helicopter, although the Puma was also used with great success. Other aircraft were employed: for air support the T-6 Texan, the F-86 Sabre and the Fiat G.91 were used, along with a quantity of B-26 Invaders covertly acquired in 1965; for reconnaissance the Dornier Do 27 was employed. In the transport role, the Portuguese Air Force originally used the Junkers Ju 52, followed by the Nord Noratlas, the C-54 Skymaster, and the C-47 Skytrain (all of these aircraft were also used for Paratroop drop operations). From 1965, Portugal began to purchase the Fiat G.91 to deploy to its African overseas territories of Mozambique, Guinea and Angola in the close-support role. The first 40 G.91 were purchased second-hand from the Luftwaffe, aircraft that had been produced for Greece and which differed from the rest of the Luftwaffe G.91s enough to create maintenance problems. The aircraft replaced the Portuguese F-86 Sabre.